does the quad have fresh oil?
i would change the oil and use a non synthetic oil, like regular valvoline 10w30 ( in the white and blue bottle).
i dont remember if that quad has an automatic clutch, but if it does, adjust the automatic clutch "preload". my Recon has an auto clutch, and if you dont adjust the "preload" by turning a screw and locknut @ the specified maintenence intervels, it will do what you describe.
The Original Michrider
( "Michriders", Coined by R4Race)
Tug Hill Veteran '03, '04
"The Lord Helps Me, So I Will Not Be Ashamed. I Will Be Determined. And I Know I Will Not Be Disgraced" ~ Isaiah 50:7
" And What We Have Is Much More Than They Can See" ~ DeLaSoul