1998 Johnson ocean pro 130 fouling 1 plug

[Ray74]

I have a ocean pro 130 and it fouls the bottom plug on the port side. Looks like carbon fouled. The insulator on that plug is black. All other plugs look normal. Good compression in all cylinders (120psi) its getting fire. Change that one plug out and it runs great then slowly starts to develop a low speed miss at idle after a few hrs . Any ideas?

 

[racerone]

Change the plug wire ?

 

[Chris1956]

Is the float adjusted properly? Is the carb bowl warped?

 

[Ray74]

All plug wires are new . Im thinking its a carb issue. Being a looper motor im unsure of which carb feeds the bottom port side cylinder. Any ideas

 

[racerone]

Look carefully.-----Looking at the motor from the boat the top carburetor on port side feeds top cylinder on starboard side.----So #4 cylinder is fed from lower carburetor on starboard side.----Not confusing at all.

 

[Ray74]

Thanks

 

[Ray74]

Going to check float height when i get home from work.