I like to know if anyone have these engine on there bike kits?

I'll like to know if anyone use these engine on there bicycles 1.www.duropower.com dp 160 5.5hp - dp 120 4.0hp ohv and dp225 7.5hp gas engine and a dp 225e gas engine with electric starter or a honda gx35 and a subaru robin eh036. anyone that in to motorized bicycle. I want to build me a motor bike. for under a $500.00