Re: Black Carbon Plugs
 

I don't have a Merc manual near me but I think you may have to ground out the purple/white timming wire from the module. I'm thinking the V module will fight to keep the idle at 750rpm's. You should be able to use a tach and vacuum gauge to set your idle mix adjustment screws then use the main throttle adjustment to touch it up or down to your 750 rpm's.

I hope someone else can confirm this but I'm pretty sure this is the procedure for that set up.

Re: Black Carbon Plugs
 

When I put the carb on it idled high. It was idleing at 1000-1100 rpm, So i turned the large screw on the carb near the throttle till it idled at about 800. I think I did the wrong move. The boat ran good but the plugs were still rich, should I turn it back to 1000rpm-1100rpm and then adjust the idle adjustment screws to lean it out till it makes 750rpm at idle. Please help its almost there, I did a plug reading they are still black carbon, but it ran, i think it just needs a little adjustment.

If I need to get a vacuum gauge, where would I attatch it to get the proper reading, and where can I get one and what should the reading be.?

Re: Black Carbon Plugs
 

When I put the carb on it idled high. It was idleing at 1000-1100 rpm, So i turned the large screw on the carb near the throttle till it idled at about 800. I think I did the wrong move. The boat ran good but the plugs were still rich, should I turn it back to 1000rpm-1100rpm and then adjust the idle adjustment screws to lean it out till it makes 750rpm at idle. Please help its almost there, I did a plug reading they are still black carbon, but it ran, i think it just needs a little adjustment.

If I need to get a vacuum gauge, where would I attatch it to get the proper reading, and where can I get one and what should the reading be.?

Re: Black Carbon Plugs
 

When you put the carb back on and it was idleing high you more than likely had a vacuum leak at the gasket. Here is the info for adjustment.

Holly Tech

Re: Black Carbon Plugs
 

Check,
I'm glad you were able to find the problem. I wasn't too far off, I did mention in a previous post that a bad power valve could be one of the causes of such a rich condition. The important thing is you found the problem, and now with a few adjustments, you'll be back on the water.