i just got a honda 70xr bike. it has everything but no the engine, any ideas on a engine was looking at the ssr or the lifan engine but wanted to see what you guys think first.

 

I would have to say that if the off brand motors out of a crf50 or the klx 110 would fit in the xr70 then run with the Gpx.. That is the motor that is ran in the Pitster Pro and personally think those are the strongest motors and somewhat reliable.