I'm planning a trip to Cloudcroft, New Mexico with my family. We live in Texas and Cloudcroft is about 9000ft. WR400, TTR125, and (2) PW80's. I'm concerned about performance if no adjustments are made. I am not interested in messing with the timing. I would like not to rejet if poss. Will a needle adjustment do the trick (at what possition?)Are the 400 and 125 (4 stroke)as effected by altitude as the 2 stroke. If adjustments are necessary, I'd like to try and do this my self. Any simple advice is appreciated.