The Secondary Slider for 50cc 1PE40QMB Minarelli Yamaha Jog style engines is made by NCY, so you know it is a high quality scooter part If your have engine that isn’t putting the power on the ground where it belongs, then consider a replacement NCY rear converter Description The Secondary Slider for 50cc 1PE40QMB Minarelli Yamaha Jog style engines is made by NCY, so you know it is a high quality scooter part. If your have engine that isn’t putting the power on the ground where it belongs, then consider a replacement NCY rear converter. These have aggressively angled slits to provide power where you need it and smooth transitions between belt positions with minimal hang up. Note: This pulley measures 33 mm internal diameter. Most Minarelli engines after 1995 used a 34 mm diameter. Please verify before the size ordering. Let Monster Scooter Parts be your source for NCY scooter parts and accessories. 1200-1033 WARNING California Residents : Proposition 65 Warning