40mm Intake Boost Cylinder


A wide 40mm intake boost cylinder with piston, rings, grunion pin, bearing, locks and gaskets. Designed for 66cc two strokes with a 38mm or 40mm stroke or if you are building a long stroke variant.



Custom 40mm wide intake port with a polished round exhaust port. Opened transfer ports that are directionally shaped. Boost ported for a reed system. All ports have been knife edged. Piston is an “A” that is windowed for 360 degree open and has additional oilers for the wrist pin. Intake and exhaust are leveled as are all the deck. All threads are tapped. $90.00 shipped USA / Territories/ APO – USD Paypal F&F : Ships same day / next day USPS Priority with tracking. Custom orders and piston B if needed. G4M cylinder may be substituted depending on current supply.