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 make this approx a 110cc engine and where? Not much luck finding a 41.1 stroke crank.