Our performance transmission kits go from stage 1 up.  You can make changes to your transmission in stages with our stage kits or all at once with our Racing PowerPak.  

Stage 1 Performance Transmission

Of all of the performance upgrades for the GY6 engine this kit provides the biggest bang for the buck of them all.  The roller weights determine how much low end torque/acceleration or how much top end flat out speed a vehicle has.  Also picking the right weights allows you to optimize between the two. 

Other variables that factor into which weights you go with include flat land or hills or mountain land or mud or sand.  Also the weight of the vehicle, whether a scooter, buggy, ATV, side-by-side or a heavy UTV will factor in.  With this kit you get to experiment and decide for yourself which weights are best suited for your specific situation.  In general for buggies we recommend starting with 14g rollers for 184cc go karts, 12g rollers for 175cc go karts and 10g rollers for 150cc go karts.  Since scooters are lighter we recommend 14g rollers for the 150cc scooters. 

Kit Contains:

• Six 9 gram roller weights
• Six 10 gram roller weights
• Six 12 gram roller weights
• Six 14 gram roller weights

How Roller Weights Work

Changing out the rollers is undoubtedly the best bang-for-the-buck upgrade there is for your buggy. Roller weights provide the upshifting forces for the CVT transmission by flinging outwards within the variator in varying stages of engine speed (RPM). Roller weight tuning is a matter of preference and riding terrain. A lighter weight will fling outward slower than a heavier weight, slowing the upshift process, and keeping the transmission in low gear longer. The stock 14.5g weights are rather heavy and upshift very fast in the RPM cycle, resulting in hindered acceleration and limited low-end grunt. These are our notes regarding tuning and roller weights.