G4M Boost ported cylinder and polished piston for 38mm and 40mm stroke engines. Show quality polish work. Bolt on performance.
A really nice G4M cylinder that is flow ported and specifically timed for either a 38mm or a 40mm stroke engine. Cylinder comes with a 40mm intake port, 3rd boost port, corrected transfer timing and a velocity windowed piston with polished dome. Ports are finished off with fine knife edging to prevent ring snag. All surfaces have been decked and all threads chased.