QuestionI have riden this bike over 6000 miles with no problems. Dealer says these bikes are bullet proof. I didn't notice the fan did not circulate when on a short ride around the neighborhood one morning. When I shut the engine off the coolant overflow ran all over the driveway. I then realized the fan wasn't running. Troubleshooting- There is a "fan switch" sensor and a "temperature switch" sensor on the radiator. We decided it was the bottom one part # 17680-48E00. We temporarily bypassed the sensor by cutting the wire just before it and tied them together. The fan ran whenever the key was turned on. I've ridden hundreds of miles waiting on the part to be delivered and I had time to do the install, no problems. Yesterday I installed the new part. Ran the bike to temperiture, the fan cycled twice. When I shut the bike off it put coolant all over the garage floor. What could be the problem? Obviously it is not a radiator problem since I rode with the fan always running with no problem? It shouldn't be a fan cycling problem since it did cycle on and off like it is should? Please let me know. Thanks for your time. Bob
AnswerHi Bob,
I suspect one or more of the following: the thermostat is defective, the water pump (impeller) is defective, or air is in the system. Most likely the thermostat.
I return tech information files by email. There was no email address with your question as requested and explained in my instructions.
Remember, anytime that the cooling system is opened to air other than opening the radiator cap or reservoir cap, the system needs to be purged of air.
Cooling systems are air-free. Air lowers the boiling point of coolant. Use a purging tool such as MityVac's Air Evac tool to do this mandatory procedure.
Respectfully,
Mark Shively
Cooling System/Engine Overheating
Primary cause:
Air in cooling system
Firing incorrect:
Spark plug dirty, broken, or maladjusted
Spark plug incorrect
IC ignitor trouble
Fuel/air mixture incorrect:
Main jet clogged or wrong size
Fuel level in carburetor float chamber too low
Carburetor holder loose
Air cleaner clogged, poorly sealed, or missing
Surge tank duct poorly sealed
Compression high:
Carbon built up in combustion chamber
Engine load faulty:
Clutch slipping
Engine oil level too high
Engine oil viscosity too high
Drive train trouble
Final gear case oil viscosity too high
Brake dragging
Lubrication inadequate:
Engine oil level too low
Engine oil poor quality or incorrect
Gauge incorrect:
Water temperature gauge broken
Water temperature sensor broken
Coolant incorrect:
Coolant level too low
Coolant deteriorated
Cooling system component incorrect:
Radiator clogged
Thermostat trouble
Radiator cap trouble
Thermostatic fan switch trouble
Fan relay trouble
Fan motor broken
Fan blade damage
Water pump not turning
Water pump impeller damaged
