I've got more then 40 hrs. on mine already using the same piston. That's something I could never get out of my 3mil 310 on alky. It's hard to explain to everyone how reliable and over engineered this set up is. I feel the consumers have been frightened by the lack of reliability on some of the other kits out there. This set up was designed right...no bandaids there.
I used the 370 as an example of how it vibrated cause I was comparing it to my 310. It vibrates a little more then that....a 370 does too. If you've ever been on a cr500 and seen how terrible those shake you will really appreciate this set up, it's incredibly smooth.
I suppose you could trail ride this monster but quite honestly why? A motor this size does go through some fuel and would probably be counter productive to a long trail ride. I also think a 100 hp trail machine is over doing it a bit. This motor was designed for full throttle blasts through the sand, the dirt, flat track racing, drag racing, hll climbs, ect...