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Type: Posts; User: John Luke

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  1. So, you are correct. But I did remove all the...

    So, you are correct. But I did remove all the nuts and bolts before getting the cylinders off. The locating pins on the cylinder were so oxidized that it literally was frozen together. Eventually I...
  2. View Post

    Thatís potentially one of the reasons I had a real hard time removing the head due to the dowel pins being rusty after I got it off and tried to remove the dowels I probably and most definitely bent...
  3. I used new oil seals. Sent from my iPhone...

    I used new oil seals.


    Sent from my iPhone using Tapatalk
  4. View Post

    Iím going to attempt to fix it. I canít even think about selling a bike thatís leaking oil.
    Is there a possibility that I over torqued the head? I torqued it to spec then did a 10+ mile ride to...
  5. Lol u fine. My main question is if I remove the...

    Lol u fine. My main question is if I remove the head and the cylinders will it cause the rings to not seat properly due to removing the pistons?
    Because at some point Iíll need to replace the...
  6. View Post

    Yes Iím talking about the base gasket.


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  7. 1981 CB750C base gasket leak after rebuild.

    If I remove the cylinder heads to replace the gasket will it decrease the compression when I put it back together? My thinking is the rings are seated and if I remove the head it will mess up the...
  8. Still a bit frustrating because it seems you said...

    Still a bit frustrating because it seems you said that you've done multiple bikes with like say a 75/115 set up and had absolutely no problem.


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  9. [emoji23] I'm ordering some air boots. Gonna...

    [emoji23] I'm ordering some air boots. Gonna throw her back together with the airbox on and see if that solves my problem.


    Sent from my iPhone using Tapatalk
  10. Still need help with tuning CB750C carbs

    I guess my question is which jet controls WOT?


    I have totally rebuilt my 1981 CB750C. I have done the timing and the valve clearances. I have 4into1 delkevic exhaust and individual K&N pod...
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    Technically itís 135 secondary and 80 mains.


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    So......... I have rebuilt the top end and now I...

    So......... I have rebuilt the top end and now I have great compression. Jetting is 135 mains and 80 secondary jets. Pulls great all the way to 60 mph and then kinda Boggs a bit. Any ideas?
    ...
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    View Post

    Alrighty then. Iíll degrease the mating surfaces and start assembling.


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    With no gasket Sent from my iPhone using...

    With no gasket


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    Okay. Well currently when I put the head on the...

    Okay. Well currently when I put the head on the cylinder no gasket and I put a light on the other side I can see a little light. Iím not sure if the head flexes after you torque it down but I was...
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    Top end rebuild on a 81 CB750C

    Iím rebuilding the top end on my 1981 CB750C it had a very small head gasket leak so while Iím already in the engine I decided to hone the cylinders and get new rings seeing as itís low on...
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    1981 CB750C Carb tuning

    I know yíall be mad at me. 😂 so I have the idle jets replaced with #38 and she now idles perfectly at 1100-1500 rpms secondary main is 75 and the main is 120. It idles and revs very response. But...
  18. Okay.[emoji1417] Sent from my iPhone using...

    Okay.[emoji1417]


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  19. View Post

    Just checked the compression on cylinder 1 itís 120-125psi. Looks like Iím gonna do the top end rebuild. More than likely thatís whatís been making my carbs go crazy.

    Thanks!


    Sent from my...
  20. Already left ordered them. Size 38. [emoji1692]...

    Already left ordered them. Size 38. [emoji1692] hoping this solves a lot of it and I also bought 105-110-115-120 main jets.




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  21. https://uploads.tapatalk-cdn.com/20191031/188cbd8b...

    https://uploads.tapatalk-cdn.com/20191031/188cbd8b8cedcd8f1f1d382c43c10e73.jpg

    Oh and donít forget my custom KZ750 that I built from scratch. And she purrs like a cat. And she pulls super hard....
  22. https://uploads.tapatalk-cdn.com/20191031/0c7446d5...

    https://uploads.tapatalk-cdn.com/20191031/0c7446d5ee881635aaae5a83084ca885.jpg

    Here is my nighthawk and she runs really well.

    Here is the photo of the bike Iím working on right...
  23. So, I took the carbs off my CB750 nighthawk and...

    So, I took the carbs off my CB750 nighthawk and put them on my custom and it runs much better. It goes back to idle really well and revs okay still a few bogging spots. But that may be because I had...
  24. View Post

    Iím beginning to think itís compression. The bike ran great earlier with the crazy jet settings but idk why itís giving me so much trouble. Right now one of the best ways to describe it is the fact...
  25. View Post

    Iíll be honest, I havenít checked compression. Only thing I checked was to see if the valves had any leaks and they were air tight. Or at least I couldnít hear or feel anything. I just bought a...
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