1992 150 HP Evinrude "Spitfire"

[william.kilpatrick]

This engine really does live up to it's name! When at idle speed it spits or as some folks say it "sneezes". This is indicative of a lean fuel condition (air). I just recently had all 6 carbs rebuilt at a local shop. While troubleshooting it, they hooked it up to a shop tank to eliminate the external fuel system. After a lot of tinkering and 3 mechanics scratching thier heads, they claimed to have the problem corrected. However, it is still sneezing though not as badly. Any sugestions?

[Dhadley]

Welcome!!Wow! Thats kind of odd for that model to do that. Its leaking air somewhere. Or one of the air bleed jets is missing. Is this a "new to you" motor? Did it ever run properly?

[william.kilpatrick]

I bought it a bout a year ago, and it has always coughed a bit. It recently got worse where it was hard to keep it running while at idle especially when I was slow trooling off-shore for kings. It's much better since the carb rebuilds but still has the sneezing problem.

[Dhadley]

What spark plugs and fuel?

[william.kilpatrick]

Using Regular 87 octane fuel. VRO is connected and functioning well. Need to check on the plugs.

[DJ]

Use only Champion plugs.

[Dhadley]

Good. Make sure they are Champions. I believe they call for QL82YC's. I use QL77JC4's in mine. Another thought, if the motor is set up in the low to mid 5000 range it might be a good idea to decarb. That may help clean up the idle.

[william.kilpatrick]

Are you referring to the Engine Tuner product that OMC makes? I used it in the Spring according to the directions. Is there something else I should consider? I'll check the plugs and replace as suggested.

[Dhadley]

Yep, that the decarb deal. Glad you already thought of it. Good stuff.

[william.kilpatrick]

I pulled a plug yesterday and is a Champion QL78YC. I am going to go get a set of the QL82YC's and install. This is what the manual recommends. Maybe that will help.

[Mike Langianese]

Troubleshooting guide at: http://www.maxrules.com/fixomcoisignition.html says that the original recommendation for QL82YC was changed to QL78YC for “improved performance. Looks like you have the "correct" plug.

[william.kilpatrick]

Thanks. That's what the dealer told me too.