Dr. Pulley15x12 Sliding Roller Weights 9.5 Gram

These weights are far and away better than the round stock weights. I was skeptical at first, however after installing these, the performance improvement was undeniable. My 50cc zuma accelerates more smoothly and achieves a higher top end. You do sacrifice some climbing speed and off the line speed. But I was more interested in top speed any way. Totally recommend

Put these in my 2008 Yamaha C3, and it was a very easy installation all things considered and it's a noticable improvement, nothing crazy of course but definitely improves acceleration and top seed

Just purchased these for my 2019 Honda Ruckus. Acceleration is slower than stock, but it didn’t sound like the engine is working nearly as hard to get up to speed which is what I wanted. Definitely will be buying these again when they wear out. Worth the $

Great prices great product fast service

Just what I needed for my 2002 Yamaha Vino-50. I wanted a nice & smooth top end cruising speed, and this along with the rest of my "tune-up" delivered just that. These slide weights along with a new belt & removing the governor spacer from the variator shaft work great. The original belt was only half worn & the old roller weights looked ok, but to hold a steady speed between 35-40mph I had to have the throttle almost wide open. Now it cruises nicely around 37mph at 3/4 throttle @ approximately 7,600rpm according to the tachometer.

Easily to install and lasts thousands of miles!

I have a 100cc big bore kit on a TaoTao Pony max speed is about 42 on a straight away with 6.5 rollers, gets up to 55 down a regular hill, up hill it does about 30-35, so I put these sliders on to see if it would get to 42 faster and help me up hills, not only does it not get to 42 faster it slowed me down to 37 and my top speed down regular hills was only about 47. Bottom Line if you have a big bore kit this will not help you, don't waste your money. I'm going to try it on my friends 50cc and maybe give another review.

Installed the 5-gram weights into a bone stock 2012 Zuma 50F with 400 miles on the clock. GPS top speed on a minor downward gradient went from 36.8 to 41.0 mph. Per the speedo, its now reading a couple mph faster in all conditions while acceleration wasn't impacted. For reference, I'm 5'-10" @ 185lbs.