Athena P400485100030 Big Bore Cylinder Kit (144cc) - 4.00mm Oversize to 58.00mm, 14:1 Compression fuel-air-carburetors-accessories-choke-plugs yet add little restriction to

yet add little restriction to the airflow of the filter

Included Soft fleece helmet bag

Fits Sherco 250/300 SC/SE-R 14-21 models

2003-2006 Gas Gas EC 450 FSE

Tanks take approx

Athena P400485100030 Big Bore Cylinder Kit (144cc) - 4.00mm Oversize to 58.00mm, 14:1 Compression fuel-air-carburetors-accessories-choke-plugs yet add little restriction toBore: 58. 00mm Sizing: Sizing Not Available Race cylinder kits include a nickel carbide coated cylinder ported to Factory. Works specs, special hard anodized exhaust valves, complete piston kit and a top end gasket set. Factory cylinder kits include all parts in the Race kits plus an aluminum cylinder head with removable brass dome allowing for higher compression and antidetonating features. REAR WHEEL HORSE POWER: 37. 6 HP 11. 200 RPM. Kits include