cb650 engine rebuild Step 4 of 4

The 650 rebuild is finished. It’s running pretty damn good. Going easy on it for the first few hundred miles.

Here’s what I did in the last step:
– Re-did my wiring, I cut out about half my wires. Props to Adam!
– Installed oil cooler
– Spot-painted frame
– Re-mounted gauges lower and tighter
– Installed new rings, assembled engine. Props to Nick!

– Original wiring

– Shit we cut out

– New wiring… streamlined!

– Ready for the engine to go back in

– All back together

– Gauges mounted lower and tighter

– Custom headlight switch, mounted in fork ear
– Oil cooler adapter plate which makes the entire cooler set-up work, purchased from:


Thanks to everyone who helped. Couldn’t have done it without you guys. Extra special thanks to Adam, for his intricate wiring knowledge, and Nick for his master engine expertise.

14 responses to “cb650 engine rebuild Step 4 of 4”

  1. scott says:


    I think you made the all right choices with the re-build and believe the oil cooler will alleviate any future charging issues!

  2. admin says:

    thanks scott, I sure hope so!

  3. dan says:

    Looks awesome man, can’t wait to see it.

  4. shelton says:

    looks great!! I’m inspired to rewire my kz 750 twin now!!

  5. blair oakley says:

    bike looks great i have a 1980 cb650c what main jets did you use i have the same set up as this pods and 4 to one header the bike iseems to run hot

  6. admin says:

    just made a new post with all the info… hope it helps!


  7. kenneth says:

    Nice. How hard was the rebuild,and how hard was parts to get

  8. Lots of good things here, thanks for your blog. I would like to add your feed to my website at bikerunity.com, do you have one available? I will come back later for your reply. Thanks!

  9. […] system is brand new – Different header/exhaust – Oil cooler – Rebuilt my entire wiring harness (check that out here) – Double checked every connection numerous […]

  10. Steve says:

    Inspiration for my next build!

  11. Cooper says:

    I tried looking everywhere for a list of what wiring you removed, but I couldn’t find anything but the reference. Any help?

  12. Greg says:

    Wow bro that bike looks great. I’m dealing with charging shit and for fuck sake why so many wires. geeze! i’m hoping the guy working on my bike with have it going. I’m already 500 plus dollars invested in the labor on the charing system. I think i got fucked on that but what can you do.

  13. James says:

    What did you do for that seat?

  14. Connor says:

    This site is so great!I will definitely be using this site a lot. My fiance just bought me an ’81 CB650. Its in pretty rough shape. Not even sure if it even runs anymore, but its going to be a fun project! I have never been one to ease in to anything, go big or go home right?!

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