Numbness in the hand while riding can be caused by gripping the throttle too tight, leaning on the throttle and restrictive gloves to name a few. Try this. Rest the ball of your hand on the forward part of the throttle. Don't squeeze. I also allow two (you may use one or three) fingers to rest on the brake lever holding the throttle with only my index finger and thumb.
If you have Kuryakyn ISO grips, a throttle boss can help. On the stock grips you can use a Cramp-buster (about $10). But what E-J said is good advice...deathgrip on the throttle will numb the hand for sure. I have had issues with numbness all along. My next solution to try is weighted bar ends. Good luck...
I have the same problem and found a palm throttle ( cramp buster etc) and found that by putting my thumb on top with the rest of the hand it solved the problem. This is the best investment ($10.00) i have put on the bike for the money and the results.
I have K. grips with throttle boss and vista cruise. Fat spongy grip and no reason to grip hard. I did see somewhere a person was selling gloves padded in a way to prevent pressure on the carpel tunnel. Made sence and looked good.
I have Throttle Rockers on both grips - take the strain off fingers, especially on the throttle hand. Probably the same concept as other throttle strain relief devices suggested here. Can be adjusted easily as they mount with Velcro fasteners.
Gel padded gloves may help. Used commonly when using string trimmers and chain saws.
As mentioned earlier just opening the fingers and laying them over the front brake or clutch levers will help to get circulation going again. The relief can be almost instant.
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