I live at about 150ft above sea and when we go to the high desert 3000/3600 ft I notice the power is a bit lazy. With these small motors a little change is noticeable. We are going to the a place called Gorman in Hungry Valley CA. and the altitude is 3000ft to 6000ft. Probally wont go as high as 6000ft, but we haven't run the buggys there since the last time we were at 3000ft the motor was stock with 10g rollers and 1500rpm spring. Also compression was 125psi and now on both buggys have about 145psi. As for jetting I am going to leave the 127.5 in the blue buggy and the 122 in the red for now.
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