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Hi,

I have a 99 Sportsman 500 and when i'm riding the four wheeler i have good acceleration up until i hit about 20 MPH then it just plateaus and i need about a quarter mile to get from 20 to 30 MPH and even longer if i want to get up to 40 MPH. What do you guys think could be the problem? I think its something to do with the clutch but i have no idea where to start or what to check.
 

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Take secondary off, thats the rear clutch, turn it over there is a large snap ring, remove it, helix will come up out of clutc, notice what holes spring is in so you can put it back, under helix are 3 buttons that are held by a torks screw, need to wind the spring 1/3 of a turn when you put it back together
 
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