I used to have trouble gripping the throttle tight enough when I wear my heavy gloves. To fix that, I sanded my stock hand grips. Just take a 1" x 12" strip of 180 grit sand paper and wrap it around the handgrip and pull it back and forth. It only takes a few mins. to do both. Just be careful not to hit the turnsignal switch housings.
Now they are much easier to grip and look like brand new.
Now they are much easier to grip and look like brand new.