[trialscat]

Hello, I'm new to this ofrum, nice to meet ya.

Hello, I'm new to this forum, nice to meet ya.

I own an old cby and recently after 30,000( on top of another 20ish) miles its started a bit of blow by,oil burning, valves are ticking and the cam adj is all the way out and ticking! I started looking around at FZ6's and 919's and I just dig the old girl. If there is anyone out there with any info on rebuilding and part availability I would appreciate it. I'd like to bore er out and basically make the bike new again, new oil pump, elec and all.
Its a Custom but with bobbed fenders, a 60's seat and low bars. I'd like to bring the cby out of it and start showing a clean ass to the newer bikes again.

Thanks,

-J

 

[kenessex]

Trialscat,
It depends on what you want out of it when you are done asto how hard it will be. An engine rebuild on the DOHC 750 is pretty straight forward. Pull the engine, tear it down and replace all the worn parts. At a minimum you are looking at a camchain, rings and a valve job. At worst you are looking at a crank, rods, pistons, bearings, etc. Either way, parts are available and the job is pretty straight forward. I would plan on putting in all new crank and rod bearings while you are in there. If you know enough to ask the right questions, then you should be able to do it.
There are plenty of guys here that have or have had the DOHC Hondas apart that can help you out.

Ken

AHRMA 412
Vintage racing - old guys on old bikes

 

[trialscat]

Thanks for your help Ken. Do you know of some good resources for parts? I'm guessing the Honda shop and oldbikebarn. Also I would like to bore it out some, have you or anybody heard of any kits available.
Thanks again for helping a kid out.

-J

 

[Highmeadow]

Trialscat, I just did a complete overhaul on my DOHC 750. Best thing you can do is get a GOOD manual. Better yet, get 2. I used a Haynes manual for reference, but found some areas lacking enough detail/photos. One of the other guys here just posted this link (ftp://manuals.homeftp.net/)that has factory manuals available. I downloaded the dohc manual and looked at it, I wish I had it when I did my rebuild, it has some better info and different pictures. You may have to copy and paste that link into your browser, I don't think I inserted it correctly.

BTW, I got all my parts at the Honda dealer, much better quality for not much more money. The only thing I bought off OBB was a stator, it was about 200 dollars cheaper!!!

Where the hell are all my 10mm wrenches?

 

[KeninIowa]

Won't a 900 motor go right in the hole?

 

[trialscat]

Highmeadow,
Thanks for the 411, very helpful. I think I've priced out a wiesco set that will bore it out with no sleeving.
I'll check that link out, also god to know the parts I'll need are availible.
Thanks again!

-J

 

[trialscat]

Ratty-550,
I thought about that and even lined one up. Last minute I decided to keep the matching number and bore the 750 out. That way I know everything is new and ready for abuse.
Plus, theres something fun about building up a 750.
Thanks for the thought though.

-J

 

[Geeto67]

quote:
Won't a 900 motor go right in the hole?

actually it won't go right in the hole. It mostly fits, but there is a little bit of a mod needed for the frame. The cb750 motor bolts directly in but for some reason the 900 mounts are slightly different and use two dogbones to attach to the frame, one on the inside of the rail and one on the outside. you will need to get all the 900 mounting stuff and I believe you need to drill a little to make her fit. It is funny because most of the motor is the same but there are little differences in the mounts and swingarms that make these DOHC cbs an adventure to work on.