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Your cart is empty.Dr. Pulley 15x12 Sliding Roller Weights for Minarelli 50cc 2-stroke engines. Please select weight from drop-down menu. These weights also fit many scooters from fits and compatible with Yamaha including Zuma CW50, Zuma 50F, Vino and C3. Select weight sizes now available in Black Pearl material: 5g. Select Weights on Sale: 8.5g, 9.5g, 10.5g. Traditionally, gear ratio is changed by the up-and-down rolling movement of the roller weights in the ramp of the Moveable Drive Pulley (MDF). Now the innovative Dr. Pulley Sliding Roller Weights slide up-and-down the ramp to change the gear ratio. This unique sliding movement (not rolling) provides exclusive advantages to increase CVT performance. With Dr. Pulley, no abnormal wear will occur even when running in high gear. Dr. Pulley's U.S. Patent Number 7,276,004 states that their sliding roller weights eliminate abnormal wear, prevent reduction gear ratio deterioration, prolong the useful life of the transmission, and have the availability to adjust reduction gear ratios as well as driving performance. At the same time, Dr. Pulley Sliding Roller Weights are also adapted to compensate wear automatically, to adjust by itself to move further outward in a movable drive pulley half and to make the vehicle reach a higher maximum vehicle speed. Please see our Warranty & Returns Policy.
Sir Sting
Reviewed in the United States on January 11, 2025
So I used these in a Yamaha Vino 50cc 2T scooter, ended up staggering them with some NCY 6g round rollers 3+3. Just keep the order correct and you’ll be fine. Pay attention to installation directions- it’s easy to improperly install these. I completely cleaned the variator of all dust + grease and appplied a molybdenum disulfide based dry-slide lubricant all over the rollers, channels, and the bushings that the plate rides on, everything worked smoothly in that configuration. Keep it clean and it’ll work fine :)
Isaac
Reviewed in the United States on April 7, 2023
Easily to install and lasts thousands of miles!
Customer
Reviewed in the United States on August 23, 2022
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.
Customer
Reviewed in the United States on July 31, 2020
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.
Nicole L. Butterfield
Reviewed in the United States on July 27, 2020
Definitely helped improve acceleration with a bit more top speed. I'm using the 5 gram weights in my Yamaha C3.
Old translator
Reviewed in the United States on August 7, 2018
Works as advertised. Could be a bit cheaper
Michael J
Reviewed in the United States on October 8, 2016
Really nice throttle response now on my aprilia sr50. Mine is a 2000 carb version and with exahaust mods to the stock exhaust, jetting and these weights I got 48.6 mph on flat ground and I weight almost 200#
jvperrine
Reviewed in the United States on August 20, 2015
These sliders work great. I suggest going a gram heavier than you would with a roller. I am using 6.5 gram sliders in my 2013 zuma 50f.
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