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  1. Replies
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    Not a 750 engine

    Not a 750 engine
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    353

    It is a k bottom end or at least k cases with the...

    It is a k bottom end or at least k cases with the f top end then so its been apart at some point.
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    353

    Yes magniflux type testing. By that picture I...

    Yes magniflux type testing. By that picture I do not think that is a crack but it could be. That is a supersport frame but those numbers on the motor are definitely a K motor See if you can find...
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    175

    I posted in your other thread.

    I posted in your other thread.
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    353

    No I have never seen a cracked sohc head. Take...

    No I have never seen a cracked sohc head. Take it to a machine shop they can detect cracks. yes you have a 76 K with that number. post a picture of the suspected crack
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    How do I add an image to a post? If you have...

    How do I add an image to a post?

    If you have uploaded an image as an attachment, you can click the arrow next to the 'Attachment Icon' and select it from the list. This will be inserted into your...
  7. http://www.cyclexchange.net/New%20Exhaust%20System...

    http://www.cyclexchange.net/New%20Exhaust%20System%20Page.htm
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    why are you concerned about the tranny? Nothing...

    why are you concerned about the tranny? Nothing you can really see without splitting the cases.
  9. If it hesitates with the stock jets then more...

    If it hesitates with the stock jets then more then likely the accelerator pump is working correct on all 4 carbs. Check make sure you have a squirt out of all 4.
  10. http://www.cyclexchange.net/Mufflers%20and%20and%2...

    http://www.cyclexchange.net/Mufflers%20and%20and%20Accessories%20Page.htm
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    The boots between the head and carbs are...

    The boots between the head and carbs are different as the later carbs are bigger. The cables are also different, the later carbs have more exposed cable and you normally cant get all the slack out...
  12. sounds like bad coil

    sounds like bad coil
  13. If your miss follows the wire then its a wire...

    If your miss follows the wire then its a wire issue. Fix this first before doing anything else.

    Sounds to me if you have one that needs a different float level then that float isnt right with the...
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    I would start searching ebay, really is the best...

    I would start searching ebay, really is the best place for used parts for these bikes.
  15. but are the passages in the carb clean? If it...

    but are the passages in the carb clean? If it responds to carb clean it is not getting fuel....or not enough...it either has a big vacuum leak or no fuel through the pilot jet. Either passage, jet...
  16. If that cylinder works when you spray carb clean...

    If that cylinder works when you spray carb clean in it then you have the pilot jet or passage still plugged.
  17. If you spray carb clean into just the #2 carb...

    If you spray carb clean into just the #2 carb does it respond? What brand coils and wires and spark plugs are you using. So does it actually not run well or just has the problem with your colortune...
  18. vintagecb750.com has new aftermarket boots for...

    vintagecb750.com has new aftermarket boots for $120. You really dont have much choice anymore either new aftermarket or watch ebay and hope you get a set that are slightly pliable.
  19. Have you ever checked compression?

    Have you ever checked compression?
  20. Thread: 1980 CB750K

    by dirtdigger
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    386

    cyclexchange.net has an aftermarket ignition...

    cyclexchange.net has an aftermarket ignition setup for the dohc motor, but its not cheap. I would stick with stock setup just look on ebay etc for the parts you are missing. Unless you have the...
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    Check the ignition advancer. These are very...

    Check the ignition advancer. These are very prone to getting sticky. They can be at base timing at idle on startup then when you get the rpms up its sticks till you shut it off or put some sort of...
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    700

    The rotor on the sohc motor is just a hunk of...

    The rotor on the sohc motor is just a hunk of metal bolted to the crank, nothing can go bad on it. Has it had this problem before the aftermarket regulator? Have heard of several bad new ones from...
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    700

    Everything done will have an affect on fuel...

    Everything done will have an affect on fuel needs. You really need to verify what jet sizes you have and what position the needles are in so you have a base line to judge your adjustments. When you...
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    Is it all stock? airbox or pods? What exhaust?...

    Is it all stock? airbox or pods? What exhaust? What pilot jets? What main jets? What position are the needs in? Float height correct? Ignition timing advance working correct and smooth?
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    Your manual is for the early K0 bikes with...

    Your manual is for the early K0 bikes with different carbs. If you notice in the photo each carb also has its own throttle cable...no linkage on the top connecting all 4 carbs thus each carb needed...
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