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Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
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My 1996 100 HP mercury 2 stroke fluctuates rpms when it is

Customer Question

My 1996 100 HP mercury 2 stroke fluctuates rpms when it is wide open and sometimes less than wide open. Is it the fuel pump or carbs or some thing else?
Submitted: 1 year ago.
Category: Boat
Expert:  Tan replied 1 year ago.
Hello Ken. My name is***** you are running at full throttle squeeze the primer bulb does the engine run better?The othwer test you need to do is use a timing light to check spark on all cylinders. Connect timing light to top cylinder run engine up to rpms is starts fluctuating then watch the flash of the timing light is it steady? Do this test for each cylinder.

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