How is this possible!?

Motoforce is definitely a brand in the up. Their kit are nicely made with a decent power output (only ever tested AC ones though).

I have lots of their parts in the garage and never had a problem with any of them.

My point was that you shouldn't have a 50cc cylinder head on a 70cc. No matter if you raise the engine or plaster it in silicone. But then again it's ur engine

 

yea i understand it shouldnt have a 50 head onit, thats why im trying to send it back.

i just tried running it, and it does coming off full throttle. i tried upjetting, doesnt work, down jetting, doesnt work.
whats wrong with it!?