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



Joined: Jun 11, 2023
Posts: 3
Location: Republic of Texas

PostPosted: Sun Jun 11, 2023 10:50 pm Reply with quote Back to top

Looking for a CB900C (may have found one) but wanted to join for the info that I am sure is here.

I rode a 900c as a teen (bike belonged to my boss and he let me ride it on occasion) and am at a point were I can have more than one bike (Just totaled a Goldwing, looking for another one of those as well), so figured why not look around for both.

Have a decent looking '81 I am going to look at tomorrow, so may be an owner by the time most read this.

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1981 CB900C 
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pd750
Moderator



Joined: Aug 01, 2007
Posts: 25092
Location: Waldron , Arkansas

PostPosted: Mon Jun 12, 2023 7:22 am Reply with quote Back to top

Welcome to the site blupupher ... Smile

_________________
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)\" .

1982 CB750C (Sold) Haven\'t found another , yet . 
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genesound
administrator



Joined: Jul 24, 2007
Posts: 44863
Location: Studio City, CA

PostPosted: Mon Jun 12, 2023 6:54 pm Reply with quote Back to top

Welcome to here.

Good luck finding a ride.

_________________
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, shop manuals.
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. 
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blupupher
This Just In
This Just In



Joined: Jun 11, 2023
Posts: 3
Location: Republic of Texas

PostPosted: Fri Jun 16, 2023 7:52 pm Reply with quote Back to top

Thanks.

Picked up an '81 CB900C with almost 25,000 miles on it Monday.

Listing had it as a running bike. Got there and it was "running" but missing on at least 1 cylinder and maybe 2. So it did run, but poorly.
I had a video of it running well on the listing, but it had sat for over a month since last started.

Bike in person was a lot rougher than pics showed, but ended up getting it anyway since I drove 180 miles to go get it.
I ended up paying $2000 for it (+ about $150 in gas and trailer rental fees), and am having a little buyers remorse at the moment.

Bike had been sitting for unknown time, but last registration was 2004.
Guy I got it from cleaned the carbs, changed the plugs, and rebuilt the brakes (both masters and all 3 calipers) and brake fluid changed.
Needs new tires. Tank has rust inside and has some repairs on the left side. Seat has a few tears in it. Brake lever is broken/bent. Some screws/nuts missing (both nuts on bottom of levers are missing, only 1 screw in airbox cover), rear suspension leaks slowly.
It has a 4 into 4 exhaust, but not sure if it is stock. Centerstand or sidestand drag when making a left turn. Seems like the left side exhaust is low?

I thought it was the coils at first, but then realized it was cylinder 1 and 3 that were not heating up (IR thermometer showed 2/4 warming up quick, 1 was a touch warmer than before starting, and 3 did not go up at all ).
Checked spark and the plugs in 1 and 3 had no spark and 2/4 were weak spark, plugs were very sooty and dark (but gapped correctly).
Got some new D9EA plugs and runs on all 4 cylinders now. Still an occasional backfire though.
I have changed all the fluids (the sub transmission was a pain, the exhaust was up against the drain bolt, which is part of why I wonder if it is a stock 4 to 4 unit).

I from reading here, I know I need to check the valve clearances, just ordered the Motion Pro valve tool, need to figure out best place to buy shims. Will check compression once that is done.
Thinking of rebuilding rear shocks (need to figure out what I should replace while they are apart).
I have ordered some GL1500 coils off e-bay, and will be doing the relay mod to power them. Wondering if I can use the GL1500 cables on the CB900? Don't care about looks as much as does it work?

Tires are on my to do list, but they hold air and roll, I want to get the bike running better before I do that (tires are old and cracked, but fine for me for a 20 mph test ride up and down the street, will replace before I take it "on the road").

I am also reading about a cam chain tensioner? I need to adjust, need to get that figured out as well.

I did get a FSM and a Clyemer manual with it, so I have the resources to do stuff, just not the knowledge and tools at the moment.

Back to reading the forums to figure stuff out.

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1981 CB900C 
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pd750
Moderator



Joined: Aug 01, 2007
Posts: 25092
Location: Waldron , Arkansas

PostPosted: Sat Jun 17, 2023 7:25 am Reply with quote Back to top

It 'looks' decent from here . Wink
You have to expect a 42 year old machine to have a few things in need .

_________________
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)\" .

1982 CB750C (Sold) Haven\'t found another , yet . 
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genesound
administrator



Joined: Jul 24, 2007
Posts: 44863
Location: Studio City, CA

PostPosted: Mon Jun 19, 2023 11:00 pm Reply with quote Back to top

Cleaning these carbs is not a quick and easy thing, and even those that are good at it may wind up doing it over.

Yeah, it looks good from across the garage over the phone. Twisted Evil

_________________
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, shop manuals.
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
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