The crankshaft is the heart and soul of your engine - Only use the best quality for maximum performance and reliability.Crankshaft Stage6 R/T, 90mm conrod / 12mm piston pin/ 44mm stroke, incl. 12mm & 13mm small end bearing, ATV 90cc (Minarelli)Uses 13x17 Wrist Pin BearingSpecial larger journals for 90cc cases to increase compressionReinforced variator side shaft for increased strength & reliabilityUses Malossi over range variator kit 5114744Shaft is hybrid of 16mm non splined from crank bearing - about 1/2" from tip it becomes splined at 13mmTECH: 44mm Stroke - 90mm RodTECH INFO86cc Malossi 44mm Stroke x 85mm Rod - 50mm Piston Bore86cc 2FAST 44mm Stroke x 90mm Rod - 50mm Piston Bore90cc 2FAST 45.8mm Stroke x 90mm Rod - 50mm Piston Bore94cc 2FAST 44mm Stroke x 90mm Rod - 52mm Piston Bore