NS25A #3 cylinder misfire

[mschifsky]

I have an '05 NS24A 4 stroke. It is missing on #3 cylinder, which I established by pulling plug wires one at a time.
The sparks jumps a good inch and cylinder has good compression, therefor it's a fuel problem.
By loosening the brass plug, I get fuel dripping, so fuel is getting to carb.
Any other tests I should do?

Thanks, Mike

 

[pvanv]

Re: NS25A #3 cylinder misfire

Check that plug. If it's dry, the carb isn't sending enough fuel. If it's soaked in gas, that carb is flooding. Either way, it's time to pull the carbs and clean/adjust them.

 

[mschifsky]

Re: NS25A #3 cylinder misfire

Thanks Paul. That did it.
I pulled the entire intake manifold and took it home to the shop. #3 carb is easy to work on without disassembling the manifold.
I found minor debris in the carb, so cleaned it. (only 150 hrs on engine).
From now on, I'm going to use only ethanol-free premium gas.
Ethanol is bad stuff for small engines, as it attracts water.
Mike