Direct bolt-on, ready-to-install cylinders; require no replating and look virtually identical to the OEM
Nickel Silicon Carbide plated for long life
Honed to exact size for easy piston installation
Big bore cylinders do not require machine work (unless noted)
Big bore cylinder kits come complete with gaskets, cylinder, piston, rings, pin and clips
These are a good engine mod for crf's kx's you name it you think your bike has power do one of these kit's and some cams do your sprockets pipe and rejet if not fuel injected and your turning your 250 into a 296 and in all reality a 450 weather it measure's in the bore or not this will make your bike faster than it's ever been no matter if your running stock engine with full bolt on mods
NOTE: Requires case machining; instructions included
REPLACEMENT PARTScrf250 2009 kit shown
Replacement Big Bore Cylinder: Order No. 140408
Replacement Big Bore Piston Kit: Order No. 131447S
Replacement Big Bore Piston Rings: Order No. 131447SR
Replacement Big Bore Gasket Kit: Order No. 263948
