2009 to 2018 Yamama Zuma 125cc scooter. Upgrade to our most popular, premium big bore kit. This 3rd version comes with a 59mm forged piston. Higher compression for premium 91-93 octane. Nikasil bore, 100% aluminium and ceramic coated. Cools faster and lasts longer. Matched to a high performance camshaft and properly sized injector. Works perfectly fine with stock ecu and stock throttle body. No fuel controller needed and yields 11.5-12hp at the wheels. Most powerful and reliable bbk in the market.