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A ported breather passageway and a machined breather window allows the air/ oil mist to flow from the flywheel cavity to the cam chest of the engine with the least possible restriction
2004-2006 Honda TRX350FE FourTrax Rancher 4x4 ES
2020-2022 Harley Davidson FLTRK Road Glide Limited
2008-2017 Yamaha XV19C Raider
cylinders add cubic inches without changing flywheels
Hot Cams 4020-1E Stage 1 Exhaust Camshaft fuel-air A ported breather passageway andExhaust Duration (Degrees at 1mm): 252. 00. Exhaust Lift (mm): 8. 10. Exhaust Lobe Center (Degrees): 104. 00. Exhaust Valve Lash (mm): . 20 Stage 1: Dual cam engine. Intake and exhaust cams sold separately. No bottom end loss with strong mid range to top end gains. Cam uses stock auto decompression mechanism. Uses stock valve springs. Vehicle Fitment: 2001 2009 Yamaha WR250F 2011 2013 Yamaha WR250F 2001 2013 Yamaha YZ250F
