Yamaha YZ250X 2023 Owner's Manual

TROUBLESHOOTING7-3Incorrect mid-high speed—Damaged or worn needle valve Replace the needle valve.Incorrect fuel level Adjust the fuel level to the properlevel.Bent, worn, or damaged starterplunger Replace the starter plunger.Incorrectly adjusted starter cable Adjust the starter cable.Clogged or damaged carburetorbreather hoseClean, repair, or replace the car-buretor breather hose.Incorrect throttle position sensorangleAdjust the throttle position sensorangle.Failed air induction system Check the air induction system.Repair or replace faulty parts.Clogged vacuum hose Clean the vacuum hose.Cracks and damage in vacuumhose Replace the vacuum hose.Damaged carburetor joint Replace the carburetor joint.Loose carburetor joint Tighten the carburetor joint boltsto the specified torque.Clogged air filter element Clean or replace the air filter ele-ment.Symptom Possible cause ActionsSpark plug does not produce asparkIncorrect spark plug gap Adjust the spark plug gap.Worn or damaged spark plug Replace the spark plug.Defective spark plug cap Replace the spark plug cap.Defective ignition coil Replace the ignition coil.CDI unit failure Replace the CDI unit.Fuel not suppliedFuel leakage Check the fuel passage. Repair orreplace as necessary.Clogged carburetor fuel passage Clean the carburetor.Clogged needle valve or needlevalve seatClean the needle valve or needlevalve seat.Damaged float Replace the float.Symptom Possible cause Actions