Here you are in the category top engine for KTM SX, MX, EXC, GS,... in 2 strokes. Here you will find all the complete kit that we can have for your machine but also all the spare parts that we can have for it. For example we have the spare cylinder, the piston with several wear ribs to choose from, rings, gasket, exhaust valve, cylinder head, clips, piston pin,... In short, everything that touches the top engine of your motorcycle. We have both original cylinders but also kits called big bore that is to say cylinder superior to the original to gain performance in all respects. For you we choose the top engines the best finished and worked to guarantee you performances but also a better reliability on your machine. We work mainly with the brands ATHENA and WORKS for the complete kits but also with VERTEX which is one of the biggest piston manufacturer in the world. We advise to change the piston and ring every 50 hours of use to avoid losing performance and especially to avoid any tightening of your machine. The more your piston starts to play, the higher the risk of tightening. That's why we offer pistons with different wear rates to compensate for this play.