Long Case GY6 Scooter Engine - 50cc, 80cc or 100cc

This is the 50cc long case scooter engine that fits scooters with long case engines. 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, long 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. The 100cc Option: This is the 100cc long case scooter engine that fits scooters with long case 50cc engines. This is the 4-Stroke complete engine, long crankcase.  For the 100cc big bore engine we install the 50mm big bore cylinder and piston and a performance head in the engine. The reason that your 50cc scooter engine is so weak and powerless is that your combustion chamber and piston is so small--only a little larger than a quarter.  see pictures below.  The power of your engine come from the explosions when the gasoline is ignited in the cylinder.  The smaller the chamber the small the explosion an