Bikeman Performance Replacement Billet Head Domes for Polaris (800 / 850 / 900)

Bikeman Performance Replacement Billet Head Domes for Polaris (800 / 850 / 900)

Bikeman Performance Replacement Billet Head Domes for Polaris 800/850/900 snowmobiles let you tune compression ratio for elevation, race fuel, or pump gas by swapping domes in Bikeman Modular Billet Head shells without replacing the whole head. CNC-machined with custom squish band profile and combustion chamber geometry for efficient flame propagation, lower operating temps, and detonation suppression. Features: modular compression tuning; optimized combustion geometry; precision CNC machined from high-grade aluminum for volume consistency and thermal dissipation; drop-in fit exclusively for Bikeman Polaris Billet Head Shells. Options: 800 Low Alt 41cc (04-311-800-41), 800 High Alt 37.5cc (04-311-800-37.5), 850 Low Alt 40.5cc/11.8:1 (04-318-850-40.5), 850 High Alt 36.5cc/12.5:1 (04-318-850-36.5), 900/9R/Big Bore Pump Gas 42cc (04-318-900-42), 900 Race Gas 37cc (04-318-900-37).

Fits: Polaris: Patriot Boost Long Track, Patriot Boost Short Track, Patriot 9R, Patriot 850 NA Long Track, Patriot 850 NA Short Track, AXYS 850, AXYS 800 H.O..

Part # 04-311-800-37.5, 04-311-800-41, 04-318-850-36.5, 04-318-850-40.5, 04-318-900-37, 04-318-900-42.

Not sure what fits your sled? Email kyle@freshiesbuilt.com with your year, make, model and track length.