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    Thread size for temp sensor in head.

    1999 Johnson 70 hp 2 stroke. On the right side of the top cyl there is a blind hole that is threaded into the head. Would be perfect place for me to install a temp sensor. Anyone know what size the thread is? I need to order a gauge and sending unit. Thank you for any information.
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    Strange Spun Prop? or 2 problems at the same time. Need help to diagnose.

    I think I spun my prop but at first I thought there was something wrong with my motor and now Im totally confused. 1999 Johnson 70 HP 3 Cyl. 2-Stroke Here are the exact symptoms in order of occurrence: - Was running at WOT with no issues - Suddenly power loss similar to running out of fuel...
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