2009 Mercury 90 Hp 2 stroke ELPTO
Will not get above 4200 RPM and not getting expected high end speed/power, and has a rough idle.
I did the "rag test", covering each carburetor in turn. The engine dies when I cover the inlet of the top and middle carburetor, but continues to run when I cover the lower carburetor, suggesting a problem with the lower cylinder.
Now for the weird part. Trying to check for spark, I used an in-line spark tester. I thought I might see spark on the top and middle cylinders and not the problem lower cylinder, but I can not see spark on any of the 3 spark plug wires. I thought the outdoor light was too bright but I tried it on my lawnmower and can see the spark easily in the same light.
It must be getting some spark as it starts and runs, although poorly.
The plugs are NGK BUZHW-2 as recommended by Mercury but now discontinued. Specs say they have a 35 Ohm resistor, but I am getting an open circuit on all 3 plugs when I check for continuity / resistance.
Will not get above 4200 RPM and not getting expected high end speed/power, and has a rough idle.
I did the "rag test", covering each carburetor in turn. The engine dies when I cover the inlet of the top and middle carburetor, but continues to run when I cover the lower carburetor, suggesting a problem with the lower cylinder.
Now for the weird part. Trying to check for spark, I used an in-line spark tester. I thought I might see spark on the top and middle cylinders and not the problem lower cylinder, but I can not see spark on any of the 3 spark plug wires. I thought the outdoor light was too bright but I tried it on my lawnmower and can see the spark easily in the same light.
It must be getting some spark as it starts and runs, although poorly.
The plugs are NGK BUZHW-2 as recommended by Mercury but now discontinued. Specs say they have a 35 Ohm resistor, but I am getting an open circuit on all 3 plugs when I check for continuity / resistance.