My quad hasnt been running right for awhile, Its all stock with its baffle removed and it runs like $hit. Its got all the power in 1st gear but after that there is non. it like gets real loud but doesnt go, you have to let off the gas and then like slowly increase speed. It will still do 75 but takes forever to get there. no power through the gears, what do you think the problem is? it hasnt had its valves or a tune up done in along time please help me out guys

 

I think you answered yourself. Also sounds like your clutch is slipping.

 

Parking brake limiter?
Clutch?
Rejet?
Dirty fuel system/carbs?

 

Sounds like the clutch to me... I kinda had the same problem, then I just adjusted the clutch at the lever and it was fine[img]i/expressions/face-icon-small-happy.gif[/img]

 

get a tune-up

 

If it's reving out and you aren't getting any power it's got to be your clutch. You can either adjust at the handle or go down to the rightside I believe and take off the cable running down. You can also adjust it there. If you got the ends go get you a racing clutch. You will enjoy that much more. You probably already burnt out your clutch dude.