Cylinder Head Temperature -- How Hot Should It Be, Anyway?
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Cylinder Head Temperature -- How Hot Should It Be, Anyway?

This is a discussion on Cylinder Head Temperature -- How Hot Should It Be, Anyway? within the Grom Talk forums, part of the Honda Grom Forums category; Greetings, I just installed a Koso Mini 3 temperature gauge. This gauge comes with a wiring harness that connects into the stock wiring; in this ...

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Thread: Cylinder Head Temperature -- How Hot Should It Be, Anyway?

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    Cylinder Head Temperature -- How Hot Should It Be, Anyway?

    Greetings,

    I just installed a Koso Mini 3 temperature gauge. This gauge comes with a wiring harness that connects into the stock wiring; in this way, the stock cylinder head temperature sensor is used as the source for the digital readout on the aftermarket (Koso) gauge.

    It seems to be working correctly, and I like the addition of the gauge thus far. My question is this: What SHOULD the appropriate temperature range be for the cylinder head? Put another way, at what temperature should I think about parking it in the shade to let it cool, or possibly adding an external oil cooler? I am an average-sized adult male rider, but I am pushing the little bike fairly hard (frequent WOT, Southern California heat) -- I want to be a bit mindful as to the temperature of the engine. Currently, the engine is nearly stock (Kitaco clutch cover, that is about it). The Koso gauge registered a maximum of 295 degrees F yesterday during a long hard ride.

    What is the "normal" cylinder head temperature range, anyway?

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    Did you set it to t-2? See page 2 of the instructions: http://kosonorthamerica.com/instructions/BA003245.pdf

    It shouldn't be getting that hot.
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    Quote Originally Posted by chaddington View Post
    Did you set it to t-2? See page 2 of the instructions: http://kosonorthamerica.com/instructions/BA003245.pdf
    It shouldn't be getting that hot.
    Thank you for the link. I believe I have it set to t-1 (I think). I was initially curious as to why you recommended setting it to t-2?.......then I saw the model-specific panel in those instructions. I guess I missed that bit of information during the install. I'll make sure I have it set to t-2 when I get home from work tonight. Thank you very much!

    Any idea what temp gauge should read?

    Thank you again for catching my probable error.

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    I only know because I made the same error. You want to keep it under 240F.
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    Sounds good. Thanks again for providing the useful insights. Cheers!

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    Is the Koso Temp gauge readable in direct sunlight???

    I hate my OPMID gauge because you could not read it in direct sunlight

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    take note, if it taps the oem temp gauge, it will measure oil temps and not the head. the head will be higher. not sure if the calibration, but if that was an accurate reading of your oil temps, it's way too hot.

    even so, the head will read different temps depending on where you measure.

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    Quote Originally Posted by CiscoSanJose View Post
    Is the Koso Temp gauge readable in direct sunlight???

    I hate my OPMID gauge because you could not read it in direct sunlight
    The Koso is most definitely readable in direct sunlight: Black LCD numbers against a light-gray background.

    From my experiences using LED pedal tuners for guitars in direct sunlight, I knew that LEDs -- conversely -- can be very hard to read in the sun.....that was part of why I opted for the Koso over the OPMID.

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    Quote Originally Posted by Paultergeist View Post
    The Koso is most definitely readable in direct sunlight: Black LCD numbers against a light-gray background.

    From my experiences using LED pedal tuners for guitars in direct sunlight, I knew that LEDs -- conversely -- can be very hard to read in the sun.....that was part of why I opted for the Koso over the OPMID.
    thanks for the info,

    What sensor did it come with? The sensor for the head or the one for the oil. I think on the takegawa cylinder there is a port where the external oil cooler can be attached to and depending on the sensor unit I can attach it there since one of the nut has a small thread hole which looks like a sensor can be attached to it.

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    It uses the stock sensor......the Koso temperature gauge comes with a wiring harness which connects into the stock wiring. The sensor used IS the STOCK sensor already in place on the lower left-side of the cylinder. I assumed that this was a "cylinder temperature" sensor, but someone else suggested that this is actually the oil temperature.

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