Big Bore Complete Kit (900cc) / Patriot 850 CHOOSE SLED FOR CLUTCH KIT:TRAIL high temperature polychloroprene with the

high temperature polychloroprene with the highest level of aramid fiber reinforcement available

Choose the compression ratio that best matches your setup during checkout:

Increased horsepower through our advanced timing and fuel curve

No need for twin pipes any more

We start off by changing out the intake and exhaust valves with larger ones then CNC porting your head to our proven specs

Big Bore Complete Kit (900cc) / Patriot 850 CHOOSE SLED FOR CLUTCH KIT:TRAIL high temperature polychloroprene with theThe 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