How do i perform a compression test on a 6hp pull start johnson outboard?
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The engine won’t start, so is a cold test ok? Please give a step by step instruction.
If you really want a good measure from your test, you need to purchase a compression testing gauge. it screws in to the same hole that your spark plug screws in to. turn the engine over a few times and watch the gauge, the highest number that it hits consistantly is your compression psi. Cold testing it should be ok, because basicly all your doing is turning over the engine like you would to start it. Good Luck
4 Responses to “How do i perform a compression test on a 6hp pull start johnson outboard?”
If you really want a good measure from your test, you need to purchase a compression testing gauge. it screws in to the same hole that your spark plug screws in to. turn the engine over a few times and watch the gauge, the highest number that it hits consistantly is your compression psi. Cold testing it should be ok, because basicly all your doing is turning over the engine like you would to start it. Good Luck
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Marine Technology Student
just press your thumb over the spark plug hole and pull the rope. if it pops your thumb off, it’s okay. that engine doesn’t need much compression to work.
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Take the spark plug out. Screw in a compression tester. Give er a good pull. Check your reading.
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try calling Car talk
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