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dugans
On a roll
On a roll



Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Tue Jul 19, 2016 9:06 pm Reply with quote Back to top

Hello from the Connecticut seacost!

Just joined this forum today and I gotta say I could have used its help about 25 years ago when I got my first old CB750.

I have had more than a few CB750s since that 1980 Custom (which is long gone) many of which were SOHC but there were indeed a few of the DOHC bikes.
Most were cheap to free and used as parts bikes back when I was young and had mostly negative cash flow.

Now I am old and have mostly negative cash flow and its been 10 years since my last bike - 73 CB750k3.

But I did pick up a fairly solid 79 Limited Edition: noisy cam chain and valves, very noisy clutch but runs.

I am in the process of going through the bike now:
valve clearance is good
front cam chain was about as loose as it can get and not come off but it seems to have tightened up ok.
Static timing done and it almost idles well.

As soon as I can swing a new set of vacuum gauges and plug wires/boots (old ones are SHOT) I think it'll be good.

I still have to check the clutch out - seems even noisier than I remember DOHC clutches being, but that could just be all the time that has passed.
I will be replacing all the cables and such that are questionable as funds allow, but not quite sure how long that is going to take just yet.

Still have to come up with the cash to insure and register the thing too, but I am to just be able to say I have an old CB750 again right now.

Getting it on the road will come.

And should be a lot easier with some of what I have already seen here: more information here than I knew back in the day (especially since I was figuring it out all by myself back then.)

After it is on the road I will start thinking about getting it "pretty."
Maybe.

_________________
1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine
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Duke
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Joined: Sep 27, 2009
Posts: 13088
Location: ABQ, NM, USA

PostPosted: Tue Jul 19, 2016 10:06 pm Reply with quote Back to top

Welcome

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Duke

1981 CB900 Custom

New Members Thread. Learn how to use the search engine, post proper sized pictures and get answers to very common questions that have been asked numerous times: Click Here

Find the FSM (factory service manual) and other tech docs here: Click Here

Have problems with your charging system?: Click Here

SeanG´s new to you bike Checklist (make your 30+ year old bike tip top before you ride it): Click Here

SeanG´s Excellent Carb Manual And Rebuild Guide: Click Here

Find out what Petcock fits your tank!! Just because you have a 1981 bike doesn't always mean it has a 1981 tank: Click Here

Buy Procom Ignitors directly from Procom´s website: Click Here

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pd750
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Joined: Aug 01, 2007
Posts: 23195
Location: Queen Creek , Arizona

PostPosted: Tue Jul 19, 2016 11:25 pm Reply with quote Back to top

Welcome to the site dugans ... Smile

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sunshine New members , Please read and understand :

Please put the year and model of your bike in the signature section on your profile page and set "Always attach signature " to YES .
NOTE : In order for your signature to show up in posts you also have to check the box that's labeled "Attach signature (signatures can be changed in profile)" , just below the Quick Reply box at the bottom of threads , when making your next post . This only has to be done once . Thanks

New Members Read This Thread :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=98405#98405

Picture Posting :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=11546

Checklist :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=68384
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Every man makes his own chains .
* *
A candle loses nothing by lighting another candle ...

"The only thing that you have which can never be replaced or recovered is your time. Use it well." Author Unknown .
* *
1982 CB750C - Sold > Looking for my next one .
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genesound
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Joined: Jul 24, 2007
Posts: 41233
Location: Studio City, CA

PostPosted: Wed Jul 20, 2016 12:05 am Reply with quote Back to top

Welcome here wave

_________________
NMT - New Member's Thread, a Must Read, click here!!! - Information For New and Veteran Members.
Contains SITE RULES, how to enter required bike information in your signature, thread and picture posting...
Also some important DOHC wrenching tips, and some other information.
Kindly read this linked thread with the rules before posting
pictures or asking lots of questions that are already answered in it.

ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
For Honda Shop Manuals (FSM), Click Here.
Click here to go fiche at Parts Pit Stop.
Click here to go fiche at Partzilla.
Sean's Bike Maintenance Checklist Click!
MacGregor Carb Rebuilding Manual, Click Here.
⊳⊳⊳⊳Learn to use the Search Engine Click Here.⊲⊲⊲⊲
Be sure to use Copper Anti-Seize on your Spark Plug Threads!
To Fix and Better Understand Your DOHC Honda Charging System, Click Here.

ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
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holysmokes
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Joined: Jul 25, 2007
Posts: 35633
Location: ridge road springfield nova scotia

PostPosted: Fri Jul 22, 2016 8:05 am Reply with quote Back to top

hello

_________________
On a steel horse i ride
.mm to inch conversion chart
http://www.carolynrelei.com/inchchart.htm
picture posting
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=127
link to manuals + tech threads>
http://www.cb750c.com/modules.php?name=Forums&file=viewforum&f=5
valve adjust thread>
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=12173&highlight=shim
check charging video
https://www.youtube.com/watch?v=YvRe9g_2gyM
carb cleaning thread>
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=13611&highlight=carb
verifying ground
https://www.youtube.com/watch?v=SyNYlaoInUE
checking stator
https://www.youtube.com/watch?v=5v2LtHlvcqI
checking r/r
https://www.youtube.com/watch?v=kDx3zgOLShY
checking rotor ohms thread>
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=1477&highlight=ohms
torque values thread >
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=81382#81382

http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=52
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=6935&highlight=shadow
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dugans
On a roll
On a roll



Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Mon Jul 25, 2016 6:47 am Reply with quote Back to top

Thanks for the welcome.

Update:
vacuum gauge set is on order along with a new adjustment tool and wires/caps.

Re-ran all of the cables and they no longer seem like they need to be replaced... imagine that.
Handlebars turn much better too. Wink

The fuel petcock may have a problem but I am not ready to get a new one just yet.

Hopefully have this thing on the road in short order.

_________________
1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine
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dugans
On a roll
On a roll



Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Fri Jul 29, 2016 10:49 am Reply with quote Back to top

Update: 7/29/2106

Carb synchronizer came wednesday and while the rest of the family was watching politics on tv I got to work on the bike.

They synced up ok but still ran rough so I figured I would leave it be since it was late-ish and pick it up again thursday.

On thursday I realized I had forgotten to put one of the vacuum port plugs back in.... DOH!
Idles pretty well after that...
Still need to get some more washers- only 2 of the port plugs have 'em.

Did some cleaning and some rehab of the tank paint: it had a crappy gloss black with flat white center stripe paint job. Sanded down and rattling canning some flat black.

Mechanically pretty sound now, other than a front brake light switch that is busted (ordered) and one leaky fork seal (will live with for a bit.)

Got the registration done and the plate is on the bike- just waiting for a lack of rain to ride now.

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1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine
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pd750
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Joined: Aug 01, 2007
Posts: 23195
Location: Queen Creek , Arizona

PostPosted: Fri Jul 29, 2016 11:00 am Reply with quote Back to top

dugans wrote:
Update: 7/29/2106

and one leaky fork seal (will live with for a bit.)


You might try a Seal Mate :

https://www.youtube.com/watch?v=8wlzfoVroSY

I made on out the side of a gallon milk jug . They do work .

_________________
sunshine New members , Please read and understand :

Please put the year and model of your bike in the signature section on your profile page and set "Always attach signature " to YES .
NOTE : In order for your signature to show up in posts you also have to check the box that's labeled "Attach signature (signatures can be changed in profile)" , just below the Quick Reply box at the bottom of threads , when making your next post . This only has to be done once . Thanks

New Members Read This Thread :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=98405#98405

Picture Posting :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=11546

Checklist :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=68384
* *
Every man makes his own chains .
* *
A candle loses nothing by lighting another candle ...

"The only thing that you have which can never be replaced or recovered is your time. Use it well." Author Unknown .
* *
1982 CB750C - Sold > Looking for my next one .
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dugans
On a roll
On a roll



Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Fri Jul 29, 2016 5:19 pm Reply with quote Back to top

Ok, now some visual proof of the bike:
First got it home:
Image

In the garage after doing a lot of the initial checks:
Image
Image

And finally, after getting it legally on the road:
Image

Definitely ride-able and also definitely NOT done:
Once it warms up idle is all over the place- well really only two places: 3000 rpm and right around stalling. Shocked

Could just be the insulators, could be that whoever the previous owner had rebuild the carbs did a... yeah, less than great job.

Like it says in the sig- Work In Progress.
It will get ridden while the work goes on.... well, maybe not AS it is being worked on, but, yeah, you get the idea I am sure.[/img]

_________________
1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine

Last edited by dugans on Fri Jul 29, 2016 5:33 pm; edited 1 time in total
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seanathon
Feel the Power
Feel the Power



Joined: Aug 08, 2014
Posts: 518
Location: Rochester, NY

PostPosted: Fri Jul 29, 2016 5:22 pm Reply with quote Back to top

Good looking bike - love the K/L/F tank style. Are your plans on restoring it, modifying it, or just making it rideable?

All good ideas Cool

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Seanathon
1981 CB750c (Felicia)
1963 BSA B40 (project)
1974 Triumph Trident T150v (future project)

New members, read the NMT (New Member's Thread) HERE
Find the FSM (Factory Service Manual) and other technical documents HERE
"They're not clean until they're 'Sean G.' Clean" - Sean's (not mine - better Sean) Carb Cleaning Manual HERE
USE THE SEARCH FEATURE FIRST before asking questions

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dugans
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On a roll



Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Fri Jul 29, 2016 5:37 pm Reply with quote Back to top

I had to fight with photobucket to get sizes right- easier to set size and THEN upload.

Basically my plan is to RIDE.
After that, getting it nicer is a plus but I have never been a fan of spending more time cleaning than riding.

I would like to have it as original as possible but since I am cheap some of the harder to find items may never appear- like proper side covers for a limited edition bike.

I'll fab up something decent enough, eventually.

By the way- it looks ok but the pics of it look much better than the bike does in person. Very Happy

_________________
1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine
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pd750
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Joined: Aug 01, 2007
Posts: 23195
Location: Queen Creek , Arizona

PostPosted: Fri Jul 29, 2016 6:00 pm Reply with quote Back to top

Pretty much same as my philosophy . Ain't much good if you aren't using it for what it was designed for . Wink

_________________
sunshine New members , Please read and understand :

Please put the year and model of your bike in the signature section on your profile page and set "Always attach signature " to YES .
NOTE : In order for your signature to show up in posts you also have to check the box that's labeled "Attach signature (signatures can be changed in profile)" , just below the Quick Reply box at the bottom of threads , when making your next post . This only has to be done once . Thanks

New Members Read This Thread :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=98405#98405

Picture Posting :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=11546

Checklist :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=68384
* *
Every man makes his own chains .
* *
A candle loses nothing by lighting another candle ...

"The only thing that you have which can never be replaced or recovered is your time. Use it well." Author Unknown .
* *
1982 CB750C - Sold > Looking for my next one .
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dugans
On a roll
On a roll



Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Sat Aug 13, 2016 3:29 pm Reply with quote Back to top

I was wondering why I had such lousy mileage (about 22mpg) so I began looking closely at my carbs. They synced up but I KNEW they weren't right.
Pulled off the exposed air cut valve cover- yup, gasket is toast.
Got stuff to make bypasses for all 4.
Pulled off the float bowl on #1- nothing dreadful.
Pulled off the float bowl on #2:
Image

Kinda explains that weird rattle...
#3 is ok, still have to open up #4.

New carb holders are expected monday (killed the bike budget for the month right there) and I am hoping that the quick and dirty carb check will help enough that I can use the bike for my commute and save money for a full carb rebuild.

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1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine
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pd750
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Joined: Aug 01, 2007
Posts: 23195
Location: Queen Creek , Arizona

PostPosted: Sat Aug 13, 2016 3:59 pm Reply with quote Back to top

Just remember to install the right jets in the right places . Wink

_________________
sunshine New members , Please read and understand :

Please put the year and model of your bike in the signature section on your profile page and set "Always attach signature " to YES .
NOTE : In order for your signature to show up in posts you also have to check the box that's labeled "Attach signature (signatures can be changed in profile)" , just below the Quick Reply box at the bottom of threads , when making your next post . This only has to be done once . Thanks

New Members Read This Thread :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=98405#98405

Picture Posting :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=11546

Checklist :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=68384
* *
Every man makes his own chains .
* *
A candle loses nothing by lighting another candle ...

"The only thing that you have which can never be replaced or recovered is your time. Use it well." Author Unknown .
* *
1982 CB750C - Sold > Looking for my next one .
View user's profile Send private message
dugans
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Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Sat Aug 13, 2016 7:05 pm Reply with quote Back to top

I went for consistency- all 4 have the same size in the same place. Wink

_________________
1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine
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pd750
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Joined: Aug 01, 2007
Posts: 23195
Location: Queen Creek , Arizona

PostPosted: Sat Aug 13, 2016 8:07 pm Reply with quote Back to top

Hopefully the PO got them right .

_________________
sunshine New members , Please read and understand :

Please put the year and model of your bike in the signature section on your profile page and set "Always attach signature " to YES .
NOTE : In order for your signature to show up in posts you also have to check the box that's labeled "Attach signature (signatures can be changed in profile)" , just below the Quick Reply box at the bottom of threads , when making your next post . This only has to be done once . Thanks

New Members Read This Thread :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=98405#98405

Picture Posting :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=11546

Checklist :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=68384
* *
Every man makes his own chains .
* *
A candle loses nothing by lighting another candle ...

"The only thing that you have which can never be replaced or recovered is your time. Use it well." Author Unknown .
* *
1982 CB750C - Sold > Looking for my next one .
View user's profile Send private message
genesound
administrator



Joined: Jul 24, 2007
Posts: 41233
Location: Studio City, CA

PostPosted: Sat Aug 13, 2016 9:13 pm Reply with quote Back to top

This:

Image

_________________
NMT - New Member's Thread, a Must Read, click here!!! - Information For New and Veteran Members.
Contains SITE RULES, how to enter required bike information in your signature, thread and picture posting...
Also some important DOHC wrenching tips, and some other information.
Kindly read this linked thread with the rules before posting
pictures or asking lots of questions that are already answered in it.

ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
For Honda Shop Manuals (FSM), Click Here.
Click here to go fiche at Parts Pit Stop.
Click here to go fiche at Partzilla.
Sean's Bike Maintenance Checklist Click!
MacGregor Carb Rebuilding Manual, Click Here.
⊳⊳⊳⊳Learn to use the Search Engine Click Here.⊲⊲⊲⊲
Be sure to use Copper Anti-Seize on your Spark Plug Threads!
To Fix and Better Understand Your DOHC Honda Charging System, Click Here.

ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
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dugans
On a roll
On a roll



Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Tue Aug 16, 2016 5:36 pm Reply with quote Back to top

I may be taking a closer look this weekend but I am hoping not:
When I took it to work last time (50 miles each way)- ran ok-ish up to about 60 and then squat. And got about 22 mpg.
A quick ride this evening felt far better and it even idles right now!
If I get decently above 30 mpg and no real issues.... Riding time.
Making the carbs RIGHT can wait until I save some coin....and can't ride due to weather. Wink

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1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine
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pd750
Moderator



Joined: Aug 01, 2007
Posts: 23195
Location: Queen Creek , Arizona

PostPosted: Tue Aug 16, 2016 8:10 pm Reply with quote Back to top

Jets in the wrong holes ?

That thing should be getting about twice the mileage and have you praying your brakes still work good .

_________________
sunshine New members , Please read and understand :

Please put the year and model of your bike in the signature section on your profile page and set "Always attach signature " to YES .
NOTE : In order for your signature to show up in posts you also have to check the box that's labeled "Attach signature (signatures can be changed in profile)" , just below the Quick Reply box at the bottom of threads , when making your next post . This only has to be done once . Thanks

New Members Read This Thread :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=98405#98405

Picture Posting :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=11546

Checklist :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=68384
* *
Every man makes his own chains .
* *
A candle loses nothing by lighting another candle ...

"The only thing that you have which can never be replaced or recovered is your time. Use it well." Author Unknown .
* *
1982 CB750C - Sold > Looking for my next one .
View user's profile Send private message
dugans
On a roll
On a roll



Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Wed Aug 17, 2016 9:17 am Reply with quote Back to top

Felt pretty good on the way here this morning.
5th gear at 6000rpm and still had plenty of power.
I'll know for sure when I get gas but I have the feeling mpg will be ok now.
It wasn't jets in the wrong holes but jets having fallen OUT of the holes entirely.
I know that at least one po was not too good with this thing so almost anything is possible, and I know the carbs need to be done up right... Just not gonna do it right NOW if I don't have to.

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1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine
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dugans
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Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Thu Aug 18, 2016 6:00 pm Reply with quote Back to top

Here is the Cheap in Connecticut update for the day:
Carbs are good enough.

Chain started jumping just a bit so I tightened it up a hair while at work and made it worse.
A bit worrying on the way home, so I loosened it up about half a hair and made it home.
Checked things closely (yeah, I know it is smart to check everything thoroughly BEFORE trying to do a 50 mile commute. Twice.) and it looks like one of the previous owners changed the rear sprocket and chain- both look fine- but was scared of changing the front sprocket.
That thing is pretty beat up.
The folks I bought it from included a new 530 chain and 16/38 sprockets, but that means converting from a 630 to 530 and I since the 630 sprockets appear to be 16/38 I am not sure I want to do that.
No gearing expert but I think that will get my highway revs screaming like a banshee.

Time to research gearing and decide which way to go.
I do know of gearingcommander, but if anyone has comments suggestions or just wants to make fun of me, feel free. Wink

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1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine
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genesound
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Joined: Jul 24, 2007
Posts: 41233
Location: Studio City, CA

PostPosted: Thu Aug 18, 2016 8:18 pm Reply with quote Back to top

You didn't say what's on it now...

Stock sprockets for your bike were 15/38 = 2.533

Those new 530 sprockets are 16/38 = 2.375, so the motor will run a wee bit slower than stock for the same ground speed.

530 is a much better chain for these bikes though. The later years after 79 used them instead of 630s. Stock they used 18/46 = 2.556 which was close to the old ratio, but had more teeth in contact with the chain, for less sprocket wear and chain stretch, but still had less rotating mass.

_________________
NMT - New Member's Thread, a Must Read, click here!!! - Information For New and Veteran Members.
Contains SITE RULES, how to enter required bike information in your signature, thread and picture posting...
Also some important DOHC wrenching tips, and some other information.
Kindly read this linked thread with the rules before posting
pictures or asking lots of questions that are already answered in it.

ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
For Honda Shop Manuals (FSM), Click Here.
Click here to go fiche at Parts Pit Stop.
Click here to go fiche at Partzilla.
Sean's Bike Maintenance Checklist Click!
MacGregor Carb Rebuilding Manual, Click Here.
⊳⊳⊳⊳Learn to use the Search Engine Click Here.⊲⊲⊲⊲
Be sure to use Copper Anti-Seize on your Spark Plug Threads!
To Fix and Better Understand Your DOHC Honda Charging System, Click Here.

ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
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dugans
On a roll
On a roll



Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Thu Aug 18, 2016 9:26 pm Reply with quote Back to top

Yeah, I forgot to mention that the 630 was on it when I bought it.
I hadn't checked into what chain came on the bike when it was new until tonight but it does look like somebody changed it.
Been too long since I messed with bikes, and even longer since I had a DOHC 750....

I truth I don't think I ever had to pay all that much attention to chains and sprockets:
never had a worn out sprocket and just replaced whatever chain was on the bike when I got it.

I think I am going to give the 16/38 a shot.
The next thing I'll have to figure out is if the chain needs to be shortened ..... well, maybe have to see if the sprockets actually FIT the bike first.
With what I have seen so far, nothing would surprise me too much, really.

Thanks for the reply- I actually DID do the research my own self but you make me feel a bit more confident that changing to the 530 is a good plan.

_________________
1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine
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genesound
administrator



Joined: Jul 24, 2007
Posts: 41233
Location: Studio City, CA

PostPosted: Thu Aug 18, 2016 10:26 pm Reply with quote Back to top

When I said what's on it now, I meant tooth count...

_________________
NMT - New Member's Thread, a Must Read, click here!!! - Information For New and Veteran Members.
Contains SITE RULES, how to enter required bike information in your signature, thread and picture posting...
Also some important DOHC wrenching tips, and some other information.
Kindly read this linked thread with the rules before posting
pictures or asking lots of questions that are already answered in it.

ŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻŻ
For Honda Shop Manuals (FSM), Click Here.
Click here to go fiche at Parts Pit Stop.
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dugans
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On a roll



Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Fri Aug 19, 2016 4:40 am Reply with quote Back to top

Current sprockets look to be 16/38 too.
Beefier chain and somewhat larger diameter, especially in th back.
Hard to count teeth(or do much work) in my garage as I have a small wood shop in there as well.

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1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine
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pd750
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Joined: Aug 01, 2007
Posts: 23195
Location: Queen Creek , Arizona

PostPosted: Fri Aug 19, 2016 7:08 am Reply with quote Back to top

Tooth count , on most sprockets , is stamped somewhere on one side or the other .

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"The only thing that you have which can never be replaced or recovered is your time. Use it well." Author Unknown .
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1982 CB750C - Sold > Looking for my next one .
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dugans
On a roll
On a roll



Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Sat Aug 20, 2016 11:34 am Reply with quote Back to top

The old sprockets were far too dirty to read anything stamped on them so I tried counting.

Once I got the old ones off: 15/38 is correct and it was a 630 chain. Like I said- cramped in my garage.

New 16/38 sprockets and 530 chain are on there now and I just came back from a short test ride.
I didn't hit the highway (looked like slow traffic) but I did get up to 60ish.
Bike felt much more to my liking: less frenetic at low speeds and rpm a bit lower.
It is not a huge difference in rpm, but just enough to be better than it was.
I verified mileage after the carb "fix" and looks to be right about 35ish. Thats on the low end of what I would expect, but not unacceptable, at least for now.

My really good news of the day is that I no longer have any chain jumping issues: rock solid, nice and smooth the whole trip. Gotta get me some more chain lube to keep it that way.
Took a look at the rear brakes while I had the wheel off- looks fine and plenty of pad.
Everything else I messed with this morning looks ok too.

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1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine
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pd750
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Joined: Aug 01, 2007
Posts: 23195
Location: Queen Creek , Arizona

PostPosted: Sat Aug 20, 2016 12:37 pm Reply with quote Back to top

The last time I put a new chain on I also installed :

Image

Probably doubled the life of the chain . It was still going strong when I sold the bike and might still be .

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sunshine New members , Please read and understand :

Please put the year and model of your bike in the signature section on your profile page and set "Always attach signature " to YES .
NOTE : In order for your signature to show up in posts you also have to check the box that's labeled "Attach signature (signatures can be changed in profile)" , just below the Quick Reply box at the bottom of threads , when making your next post . This only has to be done once . Thanks

New Members Read This Thread :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=98405#98405

Picture Posting :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=11546

Checklist :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=68384
* *
Every man makes his own chains .
* *
A candle loses nothing by lighting another candle ...

"The only thing that you have which can never be replaced or recovered is your time. Use it well." Author Unknown .
* *
1982 CB750C - Sold > Looking for my next one .
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dugans
On a roll
On a roll



Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Sat Aug 20, 2016 4:31 pm Reply with quote Back to top

Now that looks like a helluva idea.
Did you cobble that together or buy it someplace?
I've never seen a roller like that mounted on a center stand.
I'm assuming it pushes up on the chain slightly to maintain tension/reduce chain slap while still letting the center stand be high enough to be secure.

Ended up going back out and can report that while the bike is far from pretty and not exactly 100% it is pretty damn good at this point.

No problem hitting and maintaining... shall I say rapid speeds.
137 miles with most of them above 70 and at the end needed 3.3 gallons of go-juice.

Looks like I am pretty much done with "getting the bike on the road" now and down to making it better just a little bit at a time.

_________________
1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine
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pd750
Moderator



Joined: Aug 01, 2007
Posts: 23195
Location: Queen Creek , Arizona

PostPosted: Sat Aug 20, 2016 6:09 pm Reply with quote Back to top

dugans wrote:
Now that looks like a helluva idea.
Did you cobble that together or buy it someplace?
I've never seen a roller like that mounted on a center stand.
I'm assuming it pushes up on the chain slightly to maintain tension/reduce chain slap while still letting the center stand be high enough to be secure.

Ended up going back out and can report that while the bike is far from pretty and not exactly 100% it is pretty damn good at this point.

No problem hitting and maintaining... shall I say rapid speeds.
137 miles with most of them above 70 and at the end needed 3.3 gallons of go-juice.

Looks like I am pretty much done with "getting the bike on the road" now and down to making it better just a little bit at a time.


Thanks . Yes , cobbled is a good description . Wink

Here's the original thread on that tensioner :

http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=2880&highlight=tensioner

_________________
sunshine New members , Please read and understand :

Please put the year and model of your bike in the signature section on your profile page and set "Always attach signature " to YES .
NOTE : In order for your signature to show up in posts you also have to check the box that's labeled "Attach signature (signatures can be changed in profile)" , just below the Quick Reply box at the bottom of threads , when making your next post . This only has to be done once . Thanks

New Members Read This Thread :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=98405#98405

Picture Posting :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&t=11546

Checklist :
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=68384
* *
Every man makes his own chains .
* *
A candle loses nothing by lighting another candle ...

"The only thing that you have which can never be replaced or recovered is your time. Use it well." Author Unknown .
* *
1982 CB750C - Sold > Looking for my next one .
View user's profile Send private message
dugans
On a roll
On a roll



Joined: Jul 19, 2016
Posts: 119
Location: Bridgeport, Connecticut

PostPosted: Sun Aug 21, 2016 4:21 pm Reply with quote Back to top

Making one of those is now on my List.

Also on the list: new fork seals-
tried the seal-mate clone but just a short ride was enough to show that it did not do the trick.
There was a big pile of crap under the dust cover that took longer to clean out than it took to try to reseat the seal.

Not leaking too bad, so it is yet another item on the ToDo (when I can) List.

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1979 CB750L - Motor in many pieces
1982 CM450E - Daily bike while I rebuild the 750 engine
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