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1986-1987 Honda ATC250ES Big Red
2010-2012 Triumph Speed Triple
2008-2017 Yamaha XV19C Raider
2022-2023 Arctic Cat M 8000 Mountain Cat Alpha One ATAC ES 154
1981 Honda CM400C Custom
S&S Cycle 320-0396 3-Piece Flywheel - 4in. Stroke helmets-offroad-helmets 1986-1987 Honda ATC250ES Big RedWith sprocket bearing race Vast improvement over stock flywheels which shift out of true under heavy load. Heat treated 4140 material is 114% stronger than stock, eliminates thrust washer. Larger 1. 671in. crankpin, increased cross sectional area for increased crank pin clamping force. No welding required. Integral mainshafts, truer flywheels and less vibration. Notes: Strokes longer than stock will require S&S piston oiler set #31 2026. 07 up stock
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