Athena 50cc cylinder kit with exhaust valve for mopeds using Derbi D50B0/1 50cc 2-stroke engines.

Athena have brought the game changer by producing a cylinder for Derbi mopeds with an exhaust valve. The exhaust valve is closed at lower engine speeds which lowers the exhaust port making the engine produce more torque lower down the rev range. The diaphragm controlled valve opens at higher engine speeds which raises the exhaust port to produce more horse power higher up the rev range. This kit in combination with exhaust, carb and adjustments results in the engine performing like a motocross engine.

Included in the kit is the cylinder, head, piston kit, power valve system and all the necessary seals and gaskets for fitting.

Athena P400105100008