a stock cylinder comes with a sleeve. It iswhat the piston moves inside of. The 440 is bigger than the sleeve in circumfrence so the sleeve has to be removed and the cylinder bored out. Then a new sleev has to be inserted.
~2001 Yellow 400ex, K&N filter with Pre-filter, POLISHED Supertrapp IDS2 silencer, 20" rear Holeshots tires, Braking brake pads, Black Shockers Shockcovers, Renthal 400ex bend bars w/ oury grips, Pro Design tether kill switch, JE 440 big bore 10.5-1 piston, Dyno Jet Stage 2 kit, Removed air box lid, Duncan Racing aluminum nerfs, AC Racing full chassis skid plate, Race cut plastic, AC Racing mudscreen bumper, and a 42 pilot jet and removed choke.
*SOLD*