Check out the ambient air temperature sensor. It is located under the seat facing into the airbox and can get dirt oil etc stuck to it. It is a cheapo resistor type so anything that allows moisture to track across the pins will have an effect on it's value. Be careful how you clean it as it looks fragile.
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06 Gas Gas FSE 450 USA
07 Gas Gas FSR 450 UK with motard and dirt wheels
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