keywestskiff
New member
Hello everyone! I'm new and this is my first post. 
So, I have a 1993 (according to the serial number) 75hp Mercury 2 stroke that has (what I feel to be) a misfire issue. I've done almost everything I can think of to this motor and it still has the problem! It's driving me insane, please help!!
I've replaced all electronics except for the components that deal with the charging side of things. These are the parts I've replaced with new (not used) components. [stator, trigger, 3 coils, spark plugs, spark plug wires & switch box] The compression is 130psi across all 3 cylinders. I've removed all 3 carburetors, cleaned them out, checked all the jets and needles. I've replaced all the fuel lines on the motor including the main line in from the tank with a new primer ball that is working flawlessly. It has a slight miss that's almost not even noticeable at an idle, but when you give it full throttle to get up on plane, it doesn't seem to be wanting to go more than like 3000 RPM. I've tested everything with a DVA meter, tried choking it while giving it throttle, primed the ball while running it. All these things were done on the water under a load. It seems to run good on the hose, as most outboards with this type of an issue do.
Oh, and just to mention, I have the updated electrical system with the RED stator & capacitor along with the sealed switch box. Mine does not have the typical screws on the side of it where the wires attach to it. I tried replacing the capacitor also, but the one I got was bad out of the box and made the motor have no spark at all. The old one seemed to test out good, so I don't know!! I'm completely lost and I do NOT want to keep dumping money into this motor, I figured someone on here may have had similar issues and may be able to help me! I appreciate any help!!
So, I have a 1993 (according to the serial number) 75hp Mercury 2 stroke that has (what I feel to be) a misfire issue. I've done almost everything I can think of to this motor and it still has the problem! It's driving me insane, please help!!
I've replaced all electronics except for the components that deal with the charging side of things. These are the parts I've replaced with new (not used) components. [stator, trigger, 3 coils, spark plugs, spark plug wires & switch box] The compression is 130psi across all 3 cylinders. I've removed all 3 carburetors, cleaned them out, checked all the jets and needles. I've replaced all the fuel lines on the motor including the main line in from the tank with a new primer ball that is working flawlessly. It has a slight miss that's almost not even noticeable at an idle, but when you give it full throttle to get up on plane, it doesn't seem to be wanting to go more than like 3000 RPM. I've tested everything with a DVA meter, tried choking it while giving it throttle, primed the ball while running it. All these things were done on the water under a load. It seems to run good on the hose, as most outboards with this type of an issue do.
Oh, and just to mention, I have the updated electrical system with the RED stator & capacitor along with the sealed switch box. Mine does not have the typical screws on the side of it where the wires attach to it. I tried replacing the capacitor also, but the one I got was bad out of the box and made the motor have no spark at all. The old one seemed to test out good, so I don't know!! I'm completely lost and I do NOT want to keep dumping money into this motor, I figured someone on here may have had similar issues and may be able to help me! I appreciate any help!!