Are the pins in the wieghts touching the inside lip of the clutch? these pins wear down. These are easy to replace and cheap(they pull out and tap back in with a knurled grip to hold them in place). A worn/narrow belt can cause all kinds of issues too, slow starts,jerking at throttle up, slower than normal top speed,locked up belt in the pulleys(roll-over) and good performance when cold then declines.
|