How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Dominick Your Own Question
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1009
Experience:  25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified
Type Your Boat Question Here...
Dominick is online now
A new question is answered every 9 seconds

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: 5 months ago.
Category: Boat
Expert:  Tan replied 5 months 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.

Related Boat Questions