It? s equipped with exclusive Autolube oil injection that eliminates the need to premix fuel and oil. the 49cc engine is mildly tuned to deliver predictable power that gently eases the new rider up the off-road learning curve. 2003 Yamaha PW50 PW50 the smallest Yamaha playbike uses a mild 2-stroke engine with a simple single-speed automatic transmission. the PW50. the perfect beginner bike! Motorcycles Competition/Off Road DX615630476978640110195 DX1 ...