\', 1979 to 1983 DOHC CB750/900/1000/1100 Honda Custom, \' - \', Honda DOHC Customs, \'
  Login or Register
1979 to 1983 DOHC CB750/900/1000/1100 Honda Custom: Forums


View next topic
View previous topic
Post new topic   Reply to topic    WWW.CB750C.COM Forum Index -> Welcome and Forum Announcements
Author Message
AlexRozzi2021
Getting up steam
Getting up steam



Joined: Jan 15, 2021
Posts: 27
Location: City Bell, Argentina

PostPosted: Sat Jan 16, 2021 12:20 am Reply with quote Back to top

I, dear members I'm Alex From Argentina, glad to found this forum, I'm next to buy a 1981 CB750 C Exclusive, it seems in very good condition, seller says never opened block and it seems all original, me and my father love these Customs, so its a very delayed dream, (me 52, Father 82)
I really would appreciatte any tip about what to look for, in inspection instance, later today will visit the dealer to inspect the bike, I have very good mechanics profile and some experience, but never put my hands on an engine like this (I had many XL 125, XR 600, actually a CM 200T Twinstar, and always had hands plenty of grease, I also restored completely a 1967 Mercedes 250 SE.

Really would like to know for example how to know if timming chain is worn, or if there are potential problems on valve train, I know this engine has 4 valves / cilinder, and hidraulic actuators.
Well, all info would be very appreciatted!!!, Saturday afternoon (local) is de D day!!
put some pics of the lady
 
View user's profile Send private message Send e-mail
pd750
Moderator



Joined: Aug 01, 2007
Posts: 24778
Location: On the road , again .

PostPosted: Sat Jan 16, 2021 9:17 am Reply with quote Back to top

Welcome to the site Alex ... Smile  

If you haven't read the following page , now is the time . 
http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=80601#80601 

If you run into problems with any of that , Please let us know . Thanks . Smile

You might have a look at and download the Factory Service Manual , available in our Technical Documents section . It's free .

Sounds like you have a pretty good idea of what's good and bad in a bike .

_________________
Please put the year and model of your bike in the signature section on your profile page and set \"Always attach signature \" to YES . Just below the Reply box . 
View user's profile Send private message
genesound
administrator



Joined: Jul 24, 2007
Posts: 44106
Location: Studio City, CA

PostPosted: Sat Jan 16, 2021 6:31 pm Reply with quote Back to top

Welcome here.

Nice looking bike!

How many miles?

Read the maintenance checklist linked in my sig.

_________________
NMT - New Member 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
81 CB900C, 83 CB1000C 
View user's profile Send private message Send e-mail Visit poster's website
AlexRozzi2021
Getting up steam
Getting up steam



Joined: Jan 15, 2021
Posts: 27
Location: City Bell, Argentina

PostPosted: Mon Jan 18, 2021 12:46 pm Reply with quote Back to top

Hi!, many thanks , very useful your tips list, thanks very much.
I believe it has 143.000Km, aprox. 90.000miles
 
View user's profile Send private message Send e-mail
AlexRozzi2021
Getting up steam
Getting up steam



Joined: Jan 15, 2021
Posts: 27
Location: City Bell, Argentina

PostPosted: Mon Jan 18, 2021 12:57 pm Reply with quote Back to top

On Saturday I went to inspect it,. very nice, very original and complette, except handlebar around seat.
a little smoke on left muflers, it apears reduced when engine warmed.
I made deposit, so hope not to be trgiacal.... it coul be said I´m the new owner!
when engine is hot it sounds really nice, bike was some time stopped.
brake disc are almos like new, dont belive the was changed. could it be 90.000miles and no significant wear?
thanks a lot

PS FSM, great!!!!!!

thanks a lot

_________________
Alex Rozzi
City Bell, Argentina
1981 CB750C Exclusive
1981 CM200T Twinstar
1967 Mercedes Benz 250SE 
View user's profile Send private message Send e-mail
genesound
administrator



Joined: Jul 24, 2007
Posts: 44106
Location: Studio City, CA

PostPosted: Mon Jan 18, 2021 3:47 pm Reply with quote Back to top

Please fill in your location and sig.



Wow, 90K miles is quite a long life for one of these bikes without the motor ever being opened, quite rare IMO. If it still has good compression at that much mileage, I'd say it's had to have a lot of work beyond just good maintenance. They just don't last that long without some considerable engine work as a rule. Especially the cam chains and tensioners. Even changing oil every 1000 miles, my friends bike needed a complete overhaul at 100,000 miles.

So I couldn't hazard a guess at what your cam chains and tensioners look like. I've replaced them at 30K miles, but that was probably a bit early. The tensioner slippers can die from engine heat and crack and crumble when old. The chains die from lack of being adjusted properly, and a poor tensioner and guide design that allows them to whip back and forth at speed.

Maybe the mileage estimate is off. Could it actually be 43Km? It looks more like that. It looks too clean for 143Km miles. The forks and pipes usually have some pitting and discoloration just from dust, sand and dirt strikes while being ridden. Maybe it's just a real flattering picture.

_________________
NMT - New Member 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
81 CB900C, 83 CB1000C 
View user's profile Send private message Send e-mail Visit poster's website
AlexRozzi2021
Getting up steam
Getting up steam



Joined: Jan 15, 2021
Posts: 27
Location: City Bell, Argentina

PostPosted: Tue Jan 26, 2021 5:39 pm Reply with quote Back to top

Hi, many thanks for the comments,
yes probably it only has 43.000km, bike was stopped for a long time according owner comments, but there is a car dealer forwarding info... mmmm.
its no indicious of wear on front fork, exhaust is quite chromed, no yellow or rainbow coloration, engine bolts seems not be touched, except ex cam chain tensioner and clutch adjust. no noticeable wear on rubber rest for feet (sorry for the poor term to translate). will try to upload some pics.
the onlyu thing warning me is a little smoke on left cilinders, maybe stuck oil control rings... hope that...
I managed my signature content, pls tell me if its right
PS: tomorrow will go to bring it home!!!!

_________________
Alex Rozzi
City Bell, Argentina
1981 CB750C Exclusive
1981 CM200T Twinstar
1967 Mercedes Benz 250SE 
View user's profile Send private message Send e-mail
genesound
administrator



Joined: Jul 24, 2007
Posts: 44106
Location: Studio City, CA

PostPosted: Tue Jan 26, 2021 6:01 pm Reply with quote Back to top

Congratulations on your purchase. It's a real nice looking bike!

Probably valve stem seals are hard and need changing causing the smoke. Head work is usually the first thing for these motors. If your compression is good, you should be OK for some time. Be sure to do all the maintenance on schedule. I recommend changing the oil at least every 2000 miles though. Use good quality motorcycle rated oil, not automotive oil. High priced synthetic oil isn't really necessary, these bikes contaminate the oil too quickly and need frequent changes, so the advantages of synth oil are few.

At 43Km you're cam chain tensioners are probably still OK. Cam chains generally last 80-100Km or maybe more if you keep them adjusted snug. Use the static method to adjust the cam chains, not dynamic. Cam chains do wear though, and the effect is that the cam timing changes and so power goes down. Adjusting can't fix it the cam timing though, it happens because the chains get longer from pin and hole wear in the links, not stretch, and adjusting only takes up the slack and reduces chain whipping.

_________________
NMT - New Member 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
81 CB900C, 83 CB1000C

Last edited by genesound on Tue Jan 26, 2021 6:09 pm; edited 1 time in total 
View user's profile Send private message Send e-mail Visit poster's website
AlexRozzi2021
Getting up steam
Getting up steam



Joined: Jan 15, 2021
Posts: 27
Location: City Bell, Argentina

PostPosted: Tue Jan 26, 2021 6:06 pm Reply with quote Back to top

HERE THE PICS.

_________________
Alex Rozzi
City Bell, Argentina
1981 CB750C Exclusive
1981 CM200T Twinstar
1967 Mercedes Benz 250SE 
View user's profile Send private message Send e-mail
AlexRozzi2021
Getting up steam
Getting up steam



Joined: Jan 15, 2021
Posts: 27
Location: City Bell, Argentina

PostPosted: Tue Jan 26, 2021 6:11 pm Reply with quote Back to top

MORE PICS

_________________
Alex Rozzi
City Bell, Argentina
1981 CB750C Exclusive
1981 CM200T Twinstar
1967 Mercedes Benz 250SE 
View user's profile Send private message Send e-mail
genesound
administrator



Joined: Jul 24, 2007
Posts: 44106
Location: Studio City, CA

PostPosted: Tue Jan 26, 2021 6:13 pm Reply with quote Back to top

Please keep your inline posted pics under 640 pixels wide.

_________________
NMT - New Member 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
81 CB900C, 83 CB1000C 
View user's profile Send private message Send e-mail Visit poster's website
AlexRozzi2021
Getting up steam
Getting up steam



Joined: Jan 15, 2021
Posts: 27
Location: City Bell, Argentina

PostPosted: Tue Jan 26, 2021 6:13 pm Reply with quote Back to top

AND A FEW MORE PICS

_________________
Alex Rozzi
City Bell, Argentina
1981 CB750C Exclusive
1981 CM200T Twinstar
1967 Mercedes Benz 250SE 
View user's profile Send private message Send e-mail
AlexRozzi2021
Getting up steam
Getting up steam



Joined: Jan 15, 2021
Posts: 27
Location: City Bell, Argentina

PostPosted: Tue Jan 26, 2021 6:16 pm Reply with quote Back to top

AND 3 MORE

_________________
Alex Rozzi
City Bell, Argentina
1981 CB750C Exclusive
1981 CM200T Twinstar
1967 Mercedes Benz 250SE 
View user's profile Send private message Send e-mail
AlexRozzi2021
Getting up steam
Getting up steam



Joined: Jan 15, 2021
Posts: 27
Location: City Bell, Argentina

PostPosted: Tue Jan 26, 2021 6:24 pm Reply with quote Back to top

AlexRozzi2021 wrote:
HERE THE PICS.


Hi , many txs for your comments, I cinsidered valve stem seals, but its no noticeable more smoke after vacum due throttle cut, in my experience its seems like ring issue.
well, we will see...
what do you thinks about the real milleage after saw the pics?

thanks, again, Alex.

_________________
Alex Rozzi
City Bell, Argentina
1981 CB750C Exclusive
1981 CM200T Twinstar
1967 Mercedes Benz 250SE 
View user's profile Send private message Send e-mail
genesound
administrator



Joined: Jul 24, 2007
Posts: 44106
Location: Studio City, CA

PostPosted: Tue Jan 26, 2021 6:35 pm Reply with quote Back to top

Please limit your inline posted pics to ~640 pixels wide.

Hard to tell from looking at pictures what the actual mileage is. Can't tell what's be replaced either, like footpegs and such.

_________________
NMT - New Member 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
81 CB900C, 83 CB1000C 
View user's profile Send private message Send e-mail Visit poster's website
genesound
administrator



Joined: Jul 24, 2007
Posts: 44106
Location: Studio City, CA

PostPosted: Tue Jan 26, 2021 6:35 pm Reply with quote Back to top

Please limit your inline posted pics to ~640 pixels wide.

Hard to tell from looking at pictures what the actual mileage is. Can't tell what's been replaced either, like footpeg rubbers and such.

_________________
NMT - New Member 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
81 CB900C, 83 CB1000C 
View user's profile Send private message Send e-mail Visit poster's website
AlexRozzi2021
Getting up steam
Getting up steam



Joined: Jan 15, 2021
Posts: 27
Location: City Bell, Argentina

PostPosted: Fri Jan 29, 2021 1:06 am Reply with quote Back to top

OK, countdown finished, glad to tell that yesterday I bring my new 1981 CB 750 C exclusive, to her new Home!!!
a nice 70km trip , most on clear road, across the fields, with the hot summer wind in face, wow.... more than 15 years without riding a bike...

the bike runs great, finally very liuttle fumes on left cilinders, will se about evolution, no oil leaks, and all runs smooth, impressed with very elastic engine, next Week end, will check the entire bike, it needs carbs adjust, very poor idle, I also noticed a little hard suspension, need to check front fork air pressure, and rear springs preload and hidraulic control. (these rear shockks have a lever on bottom, I believe the adjust hidraulic damper). also need to check rear brake, (disc type) it has a long travel and very sponge effect

This bike has a very particular history, last night checking documentation I found that it wass purchased on 1982, 0km in Tokio, by a Argentine militar attachement at Yokohama, during his foreign service, and some years after that it was bringed , in 1988, to Argentina.

of course Im printing FSM, and beans Bike Maintenance Checklist wich will be invaluable help!

now have to thanks to all whom helped me with comments and suggestion, during this stage.

PS, this bike, in addition to being a desire of my own, it is my tribute to my father, who, since he first saw her, he love her, at first sight, next Saturday, me and my brother will take her, to share this gift, at his 82. Ik sure he will be very excited!!! and we will too.

will keep in touch, this , just starts!!!

_________________
Alex Rozzi
City Bell, Argentina
1981 CB750C Exclusive
1981 CM200T Twinstar
1967 Mercedes Benz 250SE 
View user's profile Send private message Send e-mail
AlexRozzi2021
Getting up steam
Getting up steam



Joined: Jan 15, 2021
Posts: 27
Location: City Bell, Argentina

PostPosted: Fri Jan 29, 2021 1:34 am Reply with quote Back to top

TAKEN PICS, WHEN BRINGING HOME

_________________
Alex Rozzi
City Bell, Argentina
1981 CB750C Exclusive
1981 CM200T Twinstar
1967 Mercedes Benz 250SE 
View user's profile Send private message Send e-mail
AlexRozzi2021
Getting up steam
Getting up steam



Joined: Jan 15, 2021
Posts: 27
Location: City Bell, Argentina

PostPosted: Fri Jan 29, 2021 1:37 am Reply with quote Back to top

Hi, any info about these mirrors?

_________________
Alex Rozzi
City Bell, Argentina
1981 CB750C Exclusive
1981 CM200T Twinstar
1967 Mercedes Benz 250SE 
View user's profile Send private message Send e-mail
pd750
Moderator



Joined: Aug 01, 2007
Posts: 24778
Location: On the road , again .

PostPosted: Fri Jan 29, 2021 8:48 am Reply with quote Back to top

The bike seems in very nice condition . thumbs up

Maybe those are aftermarket mirrors ?
Below is a pic of the stock mirrors on the American 750C .
Image

_________________
Please put the year and model of your bike in the signature section on your profile page and set \"Always attach signature \" to YES . Just below the Reply box . 
View user's profile Send private message
genesound
administrator



Joined: Jul 24, 2007
Posts: 44106
Location: Studio City, CA

PostPosted: Sat Jan 30, 2021 8:39 pm Reply with quote Back to top

Sorry, no idea about those mirrors.

_________________
NMT - New Member 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
81 CB900C, 83 CB1000C 
View user's profile Send private message Send e-mail Visit poster's website
AlexRozzi2021
Getting up steam
Getting up steam



Joined: Jan 15, 2021
Posts: 27
Location: City Bell, Argentina

PostPosted: Sun Jan 31, 2021 12:34 am Reply with quote Back to top

Hi, yes, I´m sure my mirrors are aftermarket.
I found they have a red position light and yellow turn signl inside lens.

_________________
Alex Rozzi
City Bell, Argentina
1981 CB750C Exclusive
1981 CM200T Twinstar
1967 Mercedes Benz 250SE 
View user's profile Send private message Send e-mail
genesound
administrator



Joined: Jul 24, 2007
Posts: 44106
Location: Studio City, CA

PostPosted: Sun Jan 31, 2021 12:39 am Reply with quote Back to top

AlexRozzi2021 wrote:
Hi, yes, I´m sure my mirrors are aftermarket.
I found they have a red position light and yellow turn signl inside lens.


Nice!

_________________
NMT - New Member 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
81 CB900C, 83 CB1000C 
View user's profile Send private message Send e-mail Visit poster's website
Display posts from previous:       
Post new topic   Reply to topic    WWW.CB750C.COM Forum Index -> Welcome and Forum Announcements

View next topic
View previous topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum


Powered by phpBB © 2001-2008 phpBB Group
:: Theme & Graphics by Daz :: Ported for PHP-Nuke by nukemods.com ::
All times are GMT - 5 Hours
 
Page Generation: 0.30 Seconds

:: fisubice phpbb2 style by Daz :: PHP-Nuke theme by www.nukemods.com ::
:: fisubice Theme Recoded To 100% W3C CSS & HTML 4.01 Transitional & XHTML 1.0 Transitional Compliance by RavenNuke™ TEAM ::

:: W3C CSS Compliance Validation :: W3C HTML 4.01 Transitional Compliance Validation :: W3C XHTML 1.0 Transitional Compliance Validation ::