I am considering power upgrades to my little 125cc honda and it pretty much comes down to two paths.
Buy a crankshaft, rod, piston, jug and cylinderhead from an early 80's XR200. Machine the case to fit the jug and put it all together with who knows what carb for a 17hp 200cc. Looks like that will set me back almost $600 unless I can find a whole xr200 cheap (not likely)
Buy an off the shelf Lifan 200cc motor. 16-17hp with CDI, carb, 12V electronics, electric start and everything for around $500 landed.
Sure it's a chinese clone but it is really tempting. Google turns up positive experiences and people with no experience saying they are crap.

