little boggy at alttitude

[dktraw]

06 900, seems to run real nice and crisp down around 3,000 to 4,000, but get up into elevation were we ride 6 to 8, it seems to want to bog through the entire rpm range, unless you pin it wide open. also doesnt really want to idle well up high either. sled has good compression, new plugs, cleaned exhaust valves, and reeds are in good shape. now ive done the easy stuff, what do you guys think

 

[Z-Man]

you clutching is not right for higher elevation and the idle will need to be set higher to compensate for thinner air.

 

[dktraw]

so what kind of clutching changes are we looking at? primary, secondary, both. primary has a 140/330 spring, and 70 gram weights. secondary is stock helix, with an almond spring. its got slp exhaust and intake on it, stock gearing, and 159 track.