Hoca Performance 18x14 GY6 Roller Weights Hoca Roller Weights size 18x14 for 150cc and 125cc GY6 4-stroke QMI152/157 QMJ152/157 engines.We recommend starting performance upgrades by changing the variator roller weights first.Heavier roller weights= A slower take off speed with more acceleration and a higher top speed. Lighter roller weights = A faster take off speed with less acceleration and lower top speed. Please see our Warranty & Returns Policy. Size: 18x14