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Ask Noel Schembri Your Own Question
Noel Schembri
Noel Schembri, Marine Technician
Category: Boat
Satisfied Customers: 1951
Experience:  Advanced technical diploma
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Have a 2010 mercury 15hp 2 stroke, hard to start runs very

Customer Question

Have a 2010 mercury 15hp 2 stroke, hard to start runs very erratically at idle, accellerates to around 1500 rpm no problems but then after that any throttle increase and it dies of to a stall if you let it. Will rev out using the butterfly manually, in or out of gear, but you twist the throttle, the stalling occurs
Submitted: 2 years ago.
Category: Boat
Expert:  Noel Schembri replied 2 years ago.
Hello my name is ***** ***** I will assist you. When you increase the throttle from the handle, does the butterfly open and the linkage to the trigger under the flywheel move? NOel
Customer: replied 2 years ago.
Expert:  Noel Schembri replied 2 years ago.
Ok, so the symptoms look like the carb need a good clean up and rebuild. What you need to do is to remove the carburetor by removing the two 1/2 inch nuts and the two bolts holding the plastic plate in front. Remove the fuel line and the steel link on top and it should come out. Now open the bowl and remove the float and needle. soak into carb cleaner for a couple of hours and blow with compressed air. Reassemble everything back and it should be ok. If you need further assistance let me know. Noel
Customer: replied 2 years ago.
'Ve already done that, the interior was absolutely dirt and gum free, there was definately no improvement after cleaning. It will push the boat for hours as long as you dont go too far above idle
Customer: replied 2 years ago.
Also one more thing, it seems to get a lot of recoil whn you pull the starter rope, dont know what else to call it but recoil, on motorcycles we call it kick back when kicking the starter
Expert:  Noel Schembri replied 2 years ago.
Ok it looks like the timing is out retarded or advanced. While on load try advancing the spark manually from the plastic arm to see if it helps increasing the throttle. If yes then it would need timing. Noel
Customer: replied 2 years ago.
Ok, ill tyry that tomorrow
Customer: replied 2 years ago.
Just one more thing, the faltering occurs when the plastic arm starts to move, when the throttle actually moves the arm
Expert:  Noel Schembri replied 2 years ago.
Ok then check out the wiring that it is not broken when the arm moves check wqith a spark gap tester if the engine is loosing spark on any cylinder when throttle is applied. If yes then carefully check all the wiring that moves when throttle is applied as it may be the case that one of them is broken. Noel

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