Temperature at the spark plug
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Thread: Temperature at the spark plug

  1. #1
    Senior Member Tjmay's Avatar
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    Temperature at the spark plug

    Do users of the Vapor or similar devices know the reading of the TW’s temperature at the spark plug?
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  2. #2
    Senior Member Fred's Avatar
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    My temperature sensor is located on the low drain plug. However any cheap $30 infrared laser thermometer can give accurate readings at spark plug and many other uses.
    Last edited by Fred; 02-16-2018 at 10:49 AM.
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    Senior Member GCFishguy's Avatar
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    Possibly expand on what you're looking to find out? I was just reading 3-page thread over on another air-cooled-single-cylinder forum that was all about engine temps, and how they varied wildly depending on speed, load, exactly where it was measured..ie: 40 degrees F difference from a spot an inch away on the head. or 315 at 80pmh but rolls up to 330-340 at 85mph (obviously not a TW forum..lol)
    Anyway...
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    Senior Member Smitty Blackstone's Avatar
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    If your bike is operating normally, attach the probe and set a baseline of temps at conditions that you normally ride in.
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  6. #5
    Senior Member Tjmay's Avatar
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    This question was prompted by seeing the temperature at the spark plug as reported by the just installed Vapor.

    I saw termperatures of 325 to 348 and was surprised by this. So, I wanted to know if any other owners of TWs who measure temperature at the spark plug could confirm that this is normal operating range.

  7. #6
    Senior Member GCFishguy's Avatar
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    Well, 'over there' the user reported temps with the TT Vapor and the CHT hooked up: 330-340F at highway speeds. And that is an air/oil cooled DR650... So those temps don't seem completely out to lunch.

  8. #7
    Super Moderator Purple's Avatar
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    You can do some reading here - Spark Plug Cross Reference HEAT RANGE CHART

    But as has been said - mixture, altitude, throttle, strain on engine - too many variables .......
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  9. #8
    Senior Member Smitty Blackstone's Avatar
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    I've seen approx. 370 on my TW. And it wasn't overheating.

  10. #9
    Senior Member Tjmay's Avatar
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    Thanx for all the input.

    Now I have a baseline...
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    Senior Member phelonius's Avatar
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    It hurts if I put my finger there when the engine has been running. I doesn't when I do it before starting it up.
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