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Am I cool to run my current set up of Mac 4-1 headers and #120 / #42 jets with pods for the overbore? Probably a dumb question but it's late and my head is swimming.

Thank you so much for your help!!!! I luckily have a profession machinist brother who will do the work for a case o'beer....or a few bottles of homebrew, so it looks like it will be an easy and cheaper then expected swap for me. And I am sure I can resell my pistons and brand new rings on here...

Is this just a bore out and replace Pistons with the cruizin image set? Do I need an oil cooler if I do this? And how far would I have to have the cylinder bored to? 61mm?

Well, I hadn't really looked at the Pistons that hard till you said that. I tried honing then up to see what they looked like and there is no chance of keeping it stock. so I think I will do a 61mm piston from a cb750k if I can find them.

What would I be looking for if I split the crank case? I plan on dropping the oil pan before reassembly to make sure there isn't any metal chuncks down there.

Teazer, I agree those are not normal wear marks. I believe there was a cam chain / guide failure of some kind and they replaced the parts and rebuilt the motor after, which would explane the slipper on the tensioner having no wear marks. The second to last picture, bottom left gouge is were...

Thank you for the reply! I will see if I can find that info in my manual. I agree, last night I scoured ebay looking at the few dampeners I could find, they all look par or worse then this one so I will be running it. Looks like now I can get back to the rebuild!

Bumping. If someone can confirm my thought that the chain has tensioner/guide has been replaced. If you look at the second to last picture there is a weld spot in the case. That confirms to me that the motor has been apart to fix the chain in the past. Or am I crazy??? I could really use some...

Hey guys, I am currently in the process of doing a ground up rebuild on a 1979 cb650 basket case. I have already finished completely redoing the wiring (per my only other post of an updated wiring diagram), and now ave the motor taken down to the lower end. The back story of the bike is, I...

Thank you! I have been very friggin confused by the firing order off the coils, the factory wiring had it set up this way and it just never felt right to me.

Good morning, I am new to posting in the forum, but have been reading from it for some time. I am in the process of doing a bolt up restoration on a 1979 cb650. I decided to ditch the harness (I didn't want to try and bother checking all the connections and really wanted to get rid of a bunch of...