Kit 50cc high engine Ø40mm ATHENA RACING with valve DERBI euro 3 & 4

ATHENA high performance kit with exhaust valve! This guillotine valve, as on certain YAMAHA, ROTAX and other engines, allows the exhaust diagram to be lowered at low speeds to have maximum torque, and to gradually increase it at high speed for maximum power! Otherwise, the parameters speak for themselves, large compression ratio, fine mono-segment piston, cylinder head ... We are on a very powerful 50cc kit! Ideal on a cross or enduro machine which must respect the displacement of 50cc!

As an option we offer a stage 1 preparation, this preparation is a modification of the channels and the exhaust port by increasing the diagrams and improving the duct, it increases the performance of the cylinder. An improvement to the piston and the bottom of the skirt is also included in this modification. Allow a little extra time for this preparation!

Mounts on all DERBI EURO 3 and EURO 4 50cc motorcycle engines :

APRILIA RS 50 2T LC euro 2 2006-> (DERBI D50B1)
APRILIA RS4 50 2T LC euro 2 (DERBI)
APRILIA RX - SX 50 2T LC 2007-> (DERBI D50B0)
DERBI Senda DRD PRO R 50 2T LC (D50B0)
DERBI Senda DRD PRO SM 50 2T LC (D50B0)
DERBI Senda DRD RACING R - SM 50 2T LC (D50B0)
DERBI Senda EVO SM 50 2T LC (D50B0)
DERBI GPR NUDE 50 2T LC 2006-> (D50B0)
DERBI GPR RACING 50 2T LC 2006-> (D50B0)
DERBI GPR R 50 2T LC euro 2 2012->
DERBI Senda X-RACE R - X-RACE SM 50 2T LC (D50B0)
DERBI Senda X-TREME R - X-TREME SM 50 2T LC (D50B0)
GILERA RCR - SMT 50 2T LC (DERBI D50B0)

And many other machines.