Reply To: bottom cylinder fouling Big Twin 25hp

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October 25, 2020 at 8:48 pm #219341
Don
Participant

    US Member

    Kind of hard to say…. Did you decarbonize the pistons while changing the head? What does the other piston look like? What do the plugs look like? You seem to indicate that the engine runs just fine, except that it is hard to start cold. What is it that got you to pull the new head back off?