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 converterDescription 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