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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
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We have old boat but newer motor 1989 or 1990 motor on a

Customer Question

we have old boat but newer motor 1989 or 1990 motor on a good weekend it will go full power no problem then pull tube fine. next day or next week it starts but chuges chuges to get going again ? took to locale marina they do cylinder check say its fine,do not trust them! so is it electrical or gas related do i need new fuel hose after 10 years maybe ? or should i hook up external tank , water problem ? to see if runs better? is it electrical problem how do i tell difference? i think 1990s evinrude about 90 horse on a 1970 sylvan deck boat. come on ole evinrude i need help!!!
Submitted: 1 year ago.
Category: Boat
Expert:  Tan replied 1 year ago.
Hello. My name is***** we need to do first is a spark and compression test. If you believe they did the compression test then we can do just the spark test.We can do this a couple of ways. We can do a cylinder drop test with engine running pull each plug wire of one cylinder at a time. The engine should drop rpms and you should hear the popping of the spark jumping from the plug wire to the spark plug. Another test is to use a spark gap tester and finally a timing light.If we have spark on all cylinders that leaves the fuel system as the problem. We can do a cpouple of tests here when running the boat and it is acting up choke the engine. Does it run better? If no change squeeze the primer bulb when engine is acting up. Does it run better? Can you do these checks and post back with findings?