What bike is this?

tribute3 · Nov 5, 2017

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!

motodevo · Nov 7, 2017

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########).

gottagetacheaperhobby · Nov 9, 2017

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.

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tribute3 · Nov 10, 2017

motodevo said:
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...

tribute3 · Nov 10, 2017

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.