I just purchased a used MT2 with a HPI.15. It seems that sometimes as I throttle up, the truck just doesn't want to move. The engine increases inRPMs but this does not translate into movement orincreased speed. I removed the engine and exposed the clutch. Being new to R/C I am unsure what to look for. The clutch bell has a fair amount of play in it, I think. I can see the clutch shoes when I move the bell forward. Should I add shims or a washerbetween the shaft screw and bell to preventthe bellfrom moving forward? Or am I way off on my analysis? Also, how do you determine if the shoes or bell is worn? Should I install a new clutch assembly? Thanks.