1. GENERAL INFORMATION K-XCT 125i ENGINE LACKS POWER Possible cause 1. Raise wheel off the ground Wheels do not Brake dragging and spin by hand spin freely Worn or damaged wheel bearing Wheel spins freely 2. Check tire pressure Pressure low Faulty tire valve Punctured tire Pressure normal 3. Accelerate lightly Engine speed does Air cleaner dirty not increase Restricted fuel flow Clogged muffler Engine speed increase Pinched fuel tank breather 4. Check ignition timing Incorrect Faulty ECU Faulty ignition pulse generator Correct 5. Test cylinder compression Incorrect Valve stuck open Worn cylinder and piston rings Leaking head gasket Normal Improper valve timing 6. Inspect fuel flow Abnormal Faulty pressure regulator Normal 7. Inspect the fuel injector Abnormal Faulty injector Normal 8. Remove spark plug Fouled or discolored Faulty spark plug Not fouled or discolored 1-15