Losing power in high rpms

[FireFighterI]

I have an 04 trx450r and I recently put in a high compression piston and hotcams stage 2 and re jetted and also put the fuel screw in.. I live in western washington but this week i have taken my quad to Arizona to go riding.... I have been messing with the fuel screw a little bit but both my brother and I have been noticing that it pretty much loses all power at high rpms.. it it does not cut out or anything.. just loses power.. would this be because its running to rich or too lean? it does not have any poping on deceleration or anything... any help would be nice so i can get back out riding as soon as possible

[Zac1091]

did you take the air lid off? mine does that but its because its getting too much air try adjusting with the jets a little more.

[warr72]

Sounds like a lean main jet.

[fastredrider44]

agreed. But make sure your carb is CLEAN. These things are incredibly sensitive to cutting out with the smallest speck of dirt in there.