I dont like any thing thats not engined swapped. I engine swapped a honda trx400ex using a yamaha yz426 dirt bike engine built for national racing so it had a over $2000 put into engine parts n was 444cc 14:1 comp needing high oct gas. Engine put out low-mid 50s with the top rpm. I started parting out the quad. Engine was sitting around so put it in the lifan. Power went from 16hp to mid 50s with about 70hp at the crank.






Heres some ones stock 426. Mine had $2000  into the engine. Mine was alot louder to cause it had a solid core exhaust so there was nothing to quiet it down.  
yz426f fly by


Here was the my race quad the engine came out of which b4 that the engine was in the dirt bike. This quad had over $10k put into itnothing was stock looks like 2 differant quads only way to see its the same quad is by the shape of seat and frame shape.