October 20, 20241 yr Hello , my 09 pro is a pig to start when the fan is on. The previous owner fitted an inline stat, this stat switches on and off at 68c , 67c, so it's hysteresis is very low. I have a stat in the top of the radiator also, it switches on at 69c and off at 55c. Which stat would be better to use? Is 55 , 69 a correct running temp? Thank you Gary
October 20, 20241 yr Trials motors generally run hotter than other competition 2Ts to improve fuel vaporization and throttle response while sacrificing some loss of charge density. 5 to 10 degrees C of hysteresis is fairly typical.
October 20, 20241 yr @garydwall the inline one is the early version of the pro and the one located at the top of the radiator is the middle/ 2nd version of the series either will work but a 09 pro had the thermostat fitted in the radiator at the top right corner where the coolant enters the rad from the cylinder head but either will work. Later versions have the thermostat located at the bottom of the rad on the left hand side.
October 24, 20241 yr On 10/20/2024 at 6:52 PM, garydwall said: Hello , my 09 pro is a pig to start when the fan is on. The previous owner fitted an inline stat, this stat switches on and off at 68c , 67c, so it's hysteresis is very low. I have a stat in the top of the radiator also, it switches on at 69c and off at 55c. Which stat would be better to use? Is 55 , 69 a correct running temp? Thank you Gary @garydwall Obviously the thermostat switch that is best to use is the one it was fitted with when it was new by the factory who designed and made it. Parts books are easy to find on the internet. Edited October 24, 20241 yr by Tr1AL
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