91 Mercury 100 won't run past about 1800 rpm

[bikerider]

I pulled the spark plugs out and took a picture. These have about 30 minutes of run time on them and were changed after first time I could not get the boat to go above 1800-2000 rpm.

Edit: #1 would be the very top spark plug as they sit in the motor.

 

[racerone]

The bottom 2 cylinders should SPARK all the time.-----The bottom 2 carburetors do not work below about 1800 RPM>

 

[bikerider]

The bottom 2 cylinders should SPARK all the time.-----The bottom 2 carburetors do not work below about 1800 RPM>

Is there a way to test if I have two bad coils or a bad high speed stator winding?

 

[flyingscott]

Is there a way to test if I have two bad coils or a bad high speed stator winding?

Yes if you have the Factory manual you were told to buy

 

[Dave1027]

Is there a way to test if I have two bad coils or a bad high speed stator winding?

I'm a little confused. You stated earlier you don't have spark on the bottom two cylinders. That would definitely cause your motor not to rev past 1800 in the water.

But why are your bottom two spark plugs so black if they have no spark? They would be wet but clean if that was the case. I'm thinking you are getting spark at some point on those. But those two cylinders are possibly saturated with fuel/oil so it won't burn off.

Tell more about the 30 minutes on those spark plugs. Was it idling? Full throttle?