49cc 50cc 2 Stroke Racing Engine Motor, Gasoline Engine Single Cylinder Pull Rope Start Motor for Dirt Bike Pocket Bike ATV Scooters, Pocket Bike Engine Kits

Worked really great. I would buy again! The fit was perfect

So cool that this is even possible. Works great! Had fun installing it with the boys.

Absolutely stay away nothing but problems waste of money

Had to use the old trans for my China dirtbike. Engine ran great on 32:1 on first start up! I primed the engine with oil prior to adding fuel on first start up to prevent pre mature ring failure. Engine is impressive. But now doesn’t stay running on idle. I presume I need to adjust the carb or the gas tank Was dirty prior to new engine. Either way, I will be investigating before making false claim on a poor engine build

Got engine installed after fabrication. Did not line up to old mount holes. Got engine started at night and noticed little sparks coming from side of engine. Not sure if this is normal will someone advise? Video shows sparks but not the best. Sparks coming from area with arrows on picture

The pull start is hard to pull at times as if it is getting stuck or something

Pretty good got no complaints. How do I determine the front sprocket size so I could change it to a 420 pitch? That’s the only problem I’m having anybody has some info please share.

It’s a great engine it gave us 36mph which is surprising because it’s only 50 cc we put 25.1 Fuel mixture it worked good but if you keep putting the wrong fuel mixture, the engine will lock up or blow up