4. FUEL SYSTEM K-PIPE 125 TROUBLESHOOTING Engine cranks but won't start Backfiring at deceleration · No fuel in tank · Float level too low · No fuel to carburetor · Incorrectly adjusted carburetor · Cylinder flooded with fuel · Faulty exhaust muffler · No spark at plug · Clogged carburetor fuel jets · Faulty fuel pump · Float level too low · Clogged air cleaner · Intake air leak · Faulty charcoal canister Engine lacks power · Restricted fuel line · Clogged air cleaner · Faulty carburetor Rich mixture · Faulty ignition system · Float level too low Lean mixture · Clogged air jets · Intake air leak · Clogged air cleaner · Improper throttle operation Engine idles roughly, stalls or runs poorly · Faulty charcoal canister · Ignition malfunction · Faulty carburetor · Poor quality fuel · Lean or rich mixture · Clogged air cleaner · Incorrect idle speed · Worn throttle needle Misfiring during acceleration · Faulty ignition system · Faulty carburetor · Faulty accelerating pump · Faulty charcoal canister 4-3