Speedmaster Engine Heat

Discussion in 'America, Speedmaster & Rocket' started by Dr. Mark Bohn, Aug 26, 2025.

  1. Dr. Mark Bohn

    Dr. Mark Bohn Member

    Mar 22, 2024
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    13
    Mountaintop PA USA
    #1 Dr. Mark Bohn, Aug 26, 2025
    I have read on other threads that speedmaster 1200s run very hot. I have found this is the case. Is there anything that can be done to help the engine run cooler? I had my 2020 speedmaster decatted but haven't noticed any difference in the engine heat. The bike has never actually overheated. Can the radiator be modified? Is any brand or type of coolant better than the other? How often should the radiator be drained and the coolant changed?
     
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  2. joe mc donald

    joe mc donald Joe
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    Dec 26, 2014
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    #2 joe mc donald, Aug 27, 2025
    @Dr. Mark Bohn Welcome to the family. Can't help but i am sure someone will be along soon. Do tap the upload a file button and show us all the bike
     
  3. Dr. Mark Bohn

    Dr. Mark Bohn Member

    Mar 22, 2024
    26
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    Mountaintop PA USA
    #3 Dr. Mark Bohn, Aug 27, 2025
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  4. joe mc donald

    joe mc donald Joe
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    #4 joe mc donald, Aug 28, 2025
    • Agree Agree x 1
  5. triumph900

    triumph900 Active Member

    Dec 24, 2017
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    #5 triumph900, Sep 1, 2025
    Heat is an interesting, and very subjective topic.
    I have two Bonnevilles, and while they do put off some heat, they are nowhere near as warm as Tiger 900s I've demo'ed, or as my wife's Indian Scout! The Bonnevilles really only get warm while stopped and the fan is on. I personally have no issues while moving, but that's me.
    I would consider removing the fork bag to allow maximum airflow. Probably won't help much but at least can say you tried.
     
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