RUNNER/NRG/SR50 2005 -> LIQUIDE FOR DOPPLER CYLINDER (ref: 324699)

The DOPPLER cylinder head is made of aluminium. The combustion chamber is machined with a bi-hemispherical switch effect, providing better engine compression. The central spark plug offers better explosion and better thrust on the piston. The O-ring gasket mounting provides better watertightness and a more accurate chamber volume.