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  1. #1

    Join Date
    Nov 2017
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    What bike is this?

    Hey guys,

    I aquired a mystery bike. Need help identifying it because it'll need new parts. Compression seems low. It runs for a few cycles then shuts off. Can't seem to get it to run consistebtly and I been screwing with the carb screws. Kick start is pretty easy to kick over also.

    The engine says 86ml. I suspect is a Chinese brand bike, check out the pics.

    "Engine Number" is 03053258 as stamped on the frame.

    Thanks!
    Attached Images Attached Images

  2. #2
    motodevo's Avatar
    motodevo is offline Miniriders OG Master Spanner Spinner
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    Definitely Chinese. If you need a new piston/rings most chinese 86/90cc motors use a 47mm piston (same as a stock stroke 70/72cc). The engine number on the bottom of the motor on the chain side below the sprocket will confirm this if it has a 47 in the first 4 or 5 numbers (eg IP47########).
    Too many zeds in the shed

  3. #3

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    Will be difficult to tune the carb while there is no air filter on it, it would be very lean ATM. Bang a lightly oiled unifilter on it, and check valve lash before you go looking at the piston and rings.

    Sent from my ALCATEL_4034A using Tapatalk

  4. #4

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    Quote Originally Posted by motodevo View Post
    Definitely Chinese. If you need a new piston/rings most chinese 86/90cc motors use a 47mm piston (same as a stock stroke 70/72cc). The engine number on the bottom of the motor on the chain side below the sprocket will confirm this if it has a 47 in the first 4 or 5 numbers (eg IP47########).
    Great Info, thank you...

  5. #5

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    Nov 2017
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    Thats the plan...
    It was in rough shape, but it turns over fine.
    My plan is to do the following:
    Valve adjustment
    Timing
    Spark plug gap
    Oil change
    and overhaul the carb

    I hope itll start after all this!

    I'm using a Honda CT90 Manual for reference. I'm not sure how similar it will be just yet.
    unfortunately, I don't really have a compression measurement tool. I'm not keen on buying one since Ill probably never use it again.

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