MOPED ARMY

Porting for low end.

Widen but no raising of ex port.

Larger window in piston

Push out transfers tunnels as far as possible

Under piston smoothing where the gasses cross the underside of the wrist pin

Cut edges of piston skirts to allow better flow into transfers at BDC

BOOM. Raising ex port can be done but isn't needed in most kits to make much bigger power.