that thing ran very well!! (it was a fourwheeler!) not a dirt bike. he said it had a lot done to it.

 

You get a new cast cylinder. I have no idea how close the new cast cylinder matches the original one.[/quote]

the one i saw said n motion on the head but think you can get one from them that looks stock.and that 60hp was at the rear tires to not at the crank

 

The NMotion kit looks like a stock cylinder except has two different bolt patterns for the cam tensioner so it can be used on either the trx engine or the crf engine. They claim it will produce 60hp, but most of the people that I talk to say the best that they have gotten is in the upper 50's with the same engine work.

 

I have a TRX450r with 13:5 JE piston, stage 2 hot cam, yosh trs pipe, dyno jet, and porting with bigger exhuast valves. My quad dyno-ed in at 53.8 HP.