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  1. C

    50cc rebuild/upgrade problem

    Thank you so much. You made my day.
  2. C

    50cc rebuild/upgrade problem

    Thank you for the response. Any idea for a source for these parts in the USA. and would I need a different head. I'm assuming the 69mm tall cylinder would be 52mm bore.
  3. C

    50cc rebuild/upgrade problem

    I have a 139fmb 50cc 4 stroke 4 gears semi auto electric under/kick on a mini chopper. Piston and cylinder and connecting rod bad. Ordered a new crank didn't realize it was a 49.5mm stroke till after I installed it when the 39mm piston pop out the top of cylinder.what would I need to get to...
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