Here is the big bore kit proposed by ATHENA to increase the displacement of your motocross / enduro HUSQVARNA TC, TE, TXC and SMR in 250cc 4 stroke from 2003 to 2005. This kit in Ø83mm against Ø78mm of origin thus makes it possible to pass your motor bike of 250cc has 300cc! A gain of torque and performance will be immediately felt. It allows a gain of 3 HP on average which is huge on this vehicle. Enough to have fun on the tracks or in the forest. ATHENA has also planned things well because this top engine is sold complete. It includes the cylinder, piston, ring as well as all the gaskets you need for a quality and tight reassembly. The advantage of taking this engine is that it is designed to be mounted on the original connecting rod with the original cylinder head and camshaft. So you have no modification to do! Here is a detailed list of vehicles on which this cylinder can be mounted.