CDHPOWER 2 Stroke PK80 Motor 40mm only Motor-Gas Bicycle Engine Kit. CDHpower Reinforced front mount pedestal. CDHPOWER Support Team. Suitable for CDH YD100 Engine and CDH PK80 Engine. During run-in period, it is prohibited to accelerate throttle handle too fast, you can grip the handle slowly (step by step), or the motor will be locked up.