Question about 2006 Yamaha yZ 450 F
Posted by Anonymous on
Hi, Anonymous and the usual suspects are:
1. Engine oil level and SAE weight are too low or not circulating.
2. Insufficient or blocked air flow over the engine.
3. Heavy combustion chamber carbon deposits.
4. Ignition timing retarded due to faulty MAP, CKP, or CMP sensor.
5. Carburetor jetted too lean.
6. Leaking intake or exhaust valve.
7. Water coolant old or low change every two years.
8. Water pump failure.
9. Radiator clogged, cap loose or malfunctioning.
10. Radiator fans not coming on.
11. Clutch slipping, brakes dragging, heavy load, towing a trailer etc.
12. Idling too long without moving.
13. For constant hot weather temperatures, mountain, or desert riding conditions consider adding an oil cooler and or cylinder head cooler.
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Posted on Sep 27, 2016
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Posted on Jan 02, 2017
There should be a sensor in the bottom of the radiator that senses the water temperature and turns the fan on when it reaches a certain temperature. There is a sensor somewhere and I'm guessing it's in the bottom of the radiator. Jumper across it and see if the fan runs. To test it, you'll have to connect an ohm meter to it and put it in a pan of water. Slowly heat the water until the sensor changes state. Notice the water temp when this happens.
Posted on Jul 20, 2010
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