Reply To: compression test hot or cold

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October 21, 2020 at 5:37 am #219005
billw
Participant

    US Member
    The red boat wrote:

    is it best to do a compression test when the motor is warmed up or cold?
    I’m working in a Johnson RD-17

    If your motor will run, it would be interesting to try it before and after it has warmed up. (I’d like to know what your results are!) I think you will find that on a two stroke, it is not going to make a huge difference. You should see a difference, just not huge. With today’s four strokes, you can really be fooled if it’s not done on a warm engine.

    Long live American manufacturing!