maintaining correct port timing and correcting the cylinder volume for the 800 CFI/CFI HO

Units: Measures in grams (g)

Looking to add a spark arrestor to your BMP extruded aluminum Big Mo exhaust

Level 1 - 91 Octane - 130 RWHP (+25 RWHP over stock)

Big Bore Complete Kit (900cc) / Patriot 850 CHOOSE ELEVATION FOR BILLET HEAD DOMES:LOW 6000 FEET TO SEA LEVEL maintaining correct port timing andThe Polaris 850 with its huge 74mm stroke was just asking for a bigger bore and we have done our homework to bring you the 900cc Big Bore. The all new piston was designed from scratch to accommodate all of the needs of the 900. The all new 88mm piston is an ultra high quality dual ring forged piston. Bikeman exclusive head profile giving you the most focused energy possible to make the most efficient power and maintain knock protection. If you are a