\', 1979 to 1983 DOHC CB750/900/1000/1100 Honda Custom, \' - \', Honda DOHC Customs, \'
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kbroen
This Just In
This Just In



Joined: Jun 14, 2020
Posts: 5
Location: Kamloops, BC, Canada

PostPosted: Mon Jun 15, 2020 1:06 am Reply with quote Back to top

Hey guys.
Just joined the site after a member in the CB750 Facebook group sent me this way. Super pumped to be apart of this community and I hope I'll be able to contribute my part.

I also would love comments and direction for those of you that are familiar with the issues I'm working through (on the bike of course...lol). I also plan to scour the forum since I'm pretty sure I'm not the first guy to encounter my list below, so I'm not that new guy who posts a question when the answers are all already there.

I inherited my dad's 1980 CB750K. It's been sitting for 7 or 8 years, had a shed collapse on it and was just plain neglected. It was stored under cover (collapsed shed) but it was out of the weather. I'm working through all the issues that I've seen so far, which is proving to be more and more as I spend more time on it. My list so far
-cosmetic damage and fuel tank dent repaired from the shed collapse
-starter clutch upgraded to 2013 R6 assembly since a rebuild didn't fix that awful noise and it still wouldn't turn over.
-front caliper rebuilt
-new front brake line
-new front master cylinder
-steering tube bearing replaced

On the agenda:
-new ignition wires
-new iridium spark plugs
-new spark plug caps
-inline fuel filter

Problem's I don't yet have a solution for (still haven't looked through the forums yet, but I will):
-forks are scored and worn through the outer layers on the inner sides

Things I've been told to look at, but I haven't gotten to yet
-chain (o-rings rot and might be no good)
-valve clearance (don't have the specs or procedure for this)
-valve chain tension (don't have specs or procedure for this)

I think first on my list will be the valve adjustment and chain tension (unless otherwise suggested) since I've already got the tank off for repairs to it, and I plan to do all the spark plugs & wires.

Let me know what you guys think and thanks for having me.

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1980 CB750K inherited from my dad. 
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pd750
Moderator



Joined: Aug 01, 2007
Posts: 24839
Location: On the road , again .

PostPosted: Mon Jun 15, 2020 7:18 am Reply with quote Back to top

Welcome to the site kbroen ... Smile

Looks like you're on the right road .

Valves first , as almost all other motor functions are 'based' on correctly gaped and functioning valves .
.005"+/- .001" (ALL).
And , the best time to tighten the cam chains is when the valve cover is removed . Allows you to apply a bit more tension than just the springs , which 'might' be a little tired . Not to mention being able to see that they are actually tightened properly .

Good luck and post some pics of what you have , like the worn forks and anything else that would be better seen than said . Wink

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Please put the year and model of your bike in the signature section on your profile / member account page and set \\\\\\\"Always attach signature \\\\\\\" to YES . Just below the Reply box , check the box in front of \\\"Attach signature (signatures can be changed in profile)\\\" . 
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Duke
Moderator



Joined: Sep 27, 2009
Posts: 13650
Location: ABQ, NM, USA

PostPosted: Mon Jun 15, 2020 2:29 pm Reply with quote Back to top

Welcome

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Duke

1981 CB900 Custom

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kbroen
This Just In
This Just In



Joined: Jun 14, 2020
Posts: 5
Location: Kamloops, BC, Canada

PostPosted: Sun Jun 21, 2020 9:01 pm Reply with quote Back to top

Thanks.

Valve clearance is all within factory spec when I check the manual. So I feel like I lucked out there.

pd750 wrote:

And , the best time to tighten the cam chains is when the valve cover is removed . Allows you to apply a bit more tension than just the springs , which 'might' be a little tired . Not to mention being able to see that they are actually tightened properly .



When you refer to apply a little more tension, how would you go about that? What I read in the manual is loosen the locknut while engine is idling, turn the screw in and retighten locknut since it automatically sets the tension.

To me, (not versed in this system), that seems wierd or not effective enough. I'm used to applying a lot of tension and then locking it in somehow when working on a lot of automotive applications.

I'll also get pics of the fork tubes up hopefully tomorrow. Keep forgetting to get them.

I've also decided to take the entire rear end apart to check things over, I'm at the wheel bearing retainer part now, so I'm looking that all up to make sure I do it right. I can't believe the amount of chain lube that's coating everything. I don't think it's ever been cleaned.

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1980 CB750K inherited from my dad. 
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genesound
administrator



Joined: Jul 24, 2007
Posts: 44327
Location: Studio City, CA

PostPosted: Sun Jun 21, 2020 10:16 pm Reply with quote Back to top

Welcome here kbroen.

Here's some info on cam chain adjustments:

http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=359425#359425

http://www.cb750c.com/modules.php?name=Forums&file=viewtopic&p=231538&highlight=dynamic+static#231538

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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.

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81 CB900C, 83 CB1000C 
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