Yamaha 785 SuperJet 84-86.5mm Big Bore Sleeves. Performance Pre-Ported. To be used with stock stroke through 6 mil stroker motors. Blowsion custom designed include a wider exhaust port, wider boost port, deeper transfers and a narrowed skirt. Please note that the 785 sleeves fits in a 61x or 62t Yamaha casting and start at an 84mm bore.
