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    How to get RPM Reading

    I have a 1981 40hp Merc, pull start with no instumentation, I want to know the RPM it runs at to see if I can change props to get higher speed, How do I measure the RPM. I have a Tac from my racing gokart that attaches to the plug lead but it is setup for a single cilinder engine is there...
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    Merc 40 Stator

    I have a 40hp merc, serial # 7161785 made in Mississauga Ont Canada, rope start, short shaft, 2 cl. I can't find the year of the engine from the links here, the problem is the engine will not start or start intermitently, have had 3 shops look at it, first one cleaned the carbs but couldn,t pull...
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