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Discussion Starter #1
IMO this is the smartest forum on the net so this is where I want to get opinions on what my problem is.

I am either having a problem with my temp sensor or my motor is overheating.

My bike is a 2008 ZX-6R racebike that has an entirely stock motor with full exhaust w/ power commander. I am running a water/waterwetter mixture in the radiator. The temp gauge on the dash rises slowly on warmup until it hits 223f. At that point the dash begins skyrocket then begins flashing HI temp warning light (250+ degrees) the second the fan clicks on. After the fan runs for a moment the dash is still flashes showing 235f or higher temp then the fan stops and it shows a normal temp around 216f at sitting idle. When the dash is showing the warning light I can hit the ignition kill switch and the temp immediately shows around 210f to 220f.

When I am racing or riding TDs the dash flashes HI almost the entire time but the motor runs perfectly and like at Idle I can kill the engine and it will show 220f with the motor off. Ambient temp is usually 90f to 105f at the racetracks this time of year.

I have checked the sensor and the entire cooling system over and over and everything seems fine.

Am I really overheating or is the change in fluid confusing the temp sensor?
 

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Gone Ridin'
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1,705 Posts
I doubt it is the fluid (but hey, I guess anything is possible).

You might start by getting a real number for the temp. If you have or can borrow an IR thermometer/temp sensor, shoot the engine and radiator at several spots when it is at temp. and see how well the numbers agree with the display (shooting the radiator would be a good idea and specifically in the area of the temp pickup for a closer comparison).
 

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Discussion Starter #3
(shooting the radiator would be a good idea and specifically in the area of the temp pickup for a closer comparison).
Strangely, the temp sensor is in the head of the motor beneath the tank. I'm racing tomorrow @ Hallett so I might try to find someone with an IR gun laying around.
 

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Gone Ridin'
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Yeah, my bad forgot that point (and that it was a 6R). Someone at the track will almost certainly have one. I keep one handy for the tire temp checks (and I am not the only one).
 
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