Short Case GY6 QMB139 Scooter Engine 50cc, 80cc or 100cc
You have the option of getting this engine in 50cc or 80cc or 100cc with the big bore racing engine. This is the 4-Stroke complete engine, short crankcase. For the 80cc big bore engine we install a 47mm cylinder and piston. For the 100cc big bore engine we install the 50mm big bore cylinder and piston.