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Yamaha 850 Big Bore Sleeves - Blowsion

Yamaha SuperJet 850 Big Bore Sleeves. Fits 89mm to 91mm Piston. 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.
SKU: 01-03-452
Manufacturer: Blowsion
$139.95
Yamaha SuperJet 850 Big Bore Sleeves. Performance Pre-Ported. Price listed is per sleeve. 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. Due to the unique design of our 850cc big bore sleeves it is imperative that they are installed in a 760 (62T) cylinder rather than in a 701 (61X) OEM Cylinder.The 760 cylinder (and a select few 701 Runabout Cylinders) incorporates the additional cylinder material required to receive the full potential of our monster sleeves. Note:any cylinder marked as 62T can be used in conjunction with our 850cc Big Bore Sleeves. Please also note we have available spacer plates for stroker applications or to modify cylinder deck heights.

Requirements: 
- 62T (760cc) OEM Yamaha Cylinder (we may have used or exchange cores available in stock---- email!
- Pro-X Piston Kits: Available sizes ( 89.00, 89.25, 89.50, 89.75, 90.00 mm and Wiseco 90.5, 91.00 mm ). Piston kit includes (Piston, Rings and Cir-Clips). 
- Pro-X Wrist Pin Bearings.
- Blowsion Cylinder head dome blanks. To accommodate the larger bore sleeves we offer a specially designed dome that fits into both our Blowsion 1 and 2 piece heads. Domes can be custom machined to your desired preference. Please email for specifications and pricing!
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