Sprint GT Alternative Thermostat

Discussion in 'Sprint & Trophy' started by Aidan, Feb 7, 2020.

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  1. Aidan

    Aidan Well-Known Member

    Dec 31, 2018
    113
    93
    Essex
    My Sprint GT runs hot. I wanted to change the thermostat to rule out its malfunction. However, I saw the price online for a Triumph thermostat as £39!!! Plus postage! That's daylight robbery. I think there are many car thermostats out there which will probably fit and open at the same temp and be more like £5. Before I spend an afternoon down the car spares shop, does anyone know of an alternative?
     
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  2. Sprinter

    Sprinter Kinigit

    Aug 17, 2014
    5,912
    800
    Grampian.
    No, mate sorry.
     
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  3. Wire-Wheels

    Wire-Wheels Senior Member

    Apr 26, 2019
    1,025
    243
    8 time zones WEST
    #3 Wire-Wheels, Feb 8, 2020
    Last edited: Feb 8, 2020
    I don't know that I would be willing to spend ANY money until I am sure what I am buying will solve the problem. I would use one of those electronic non- contact thermometers and sense the upper radiator hose temp. I would be looking for a temp reading of 195°-210°f. You can also tape a mechanical thermometer to the hose an get a reading that is close enough. I would just stick it on with some duct tape and run the engine to get a reading. Also be certain your cooling fan is cycling on and off properly as needed before you start buying parts. ...J.D.
     
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  4. Sprinter

    Sprinter Kinigit

    Aug 17, 2014
    5,912
    800
    Grampian.
    When you say runs hot, what do you mean, what's it doing?.
     
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  5. Wire-Wheels

    Wire-Wheels Senior Member

    Apr 26, 2019
    1,025
    243
    8 time zones WEST
    Guess he got what he wanted. ...
     
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  6. Aidan

    Aidan Well-Known Member

    Dec 31, 2018
    113
    93
    Essex
    The temp gauge shows bars almost up to top on a hot day. I had an issue last year where the temp light came on after a long and hard run along the autoroute to Calais. I had to turn it off at the passport control and it took an age to cool down and re-start. The day was very hot. The fan comes on fine and the hoses feel hot, so I assume thermostat is opening. Got ECUTune and was going to lower the fan operating temp.

    Just surprises me - never had any issue like this on a water-cooled bike
     
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  7. John Watson

    John Watson New Member
    Subscriber

    Thursday
    13
    3
    Carlisle
    I would be inclined to check that the radiator is passing air through before worrying about thermostats. I am of course assuming you haven't yet looked at the radiator, apologies if you have.
     
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  8. capt

    capt Noble Member

    May 8, 2016
    1,866
    450
    western Australia
    Take out the thermostat , test it !
    Test method :- put thermostat in a pot , cover it with water , put it on a stove , slowly bring it to the boil , watch to see if it opens ! With a thermometer you can assess whether it is opening at the right temperature.
    If it is , the problem Lie's elsewhere ! If it doesn't open you have two options ! Cut centre of thermostat out and refit the outer ring or buy a replacement.
    Refitting the outer ring on it's own is at best a temporary repair , engines treated to this repair take longer to warm up to operating temperature.
     
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  9. capt

    capt Noble Member

    May 8, 2016
    1,866
    450
    western Australia
    This fix won't affect EFI any differently than a carbureted engine , it will just take three times longer to reach running temperature if the bike is ridden and moving air through the radiator before it's hot ! As the opening for coolant to flow through is fully open , it might run slightly cooler in general too.
    I've used this fix on truck , car and bike motors , it give you time to find and install a new working part...
     
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