Carbon buildup on new Plugs

[ledzeppelin135]

Hello,
I recently decarbed my 83 merc 50hp by soaking the pistons overnight and then heading to the lake and spraying deep creep in the carbs till it dies twice and then running wot. I then replaced the plugs and then tore down and cleaned the carbs and switched over to synthetic oil and just today adjusted the idle mixture. I took out the plugs to inspect the carbon buildup and was astonished as to how much carbon was on the plugs already. It seems that there is a little less buildup on the piston tops but the plugs are completely covered, it seems even more so than the old plugs I took out. I am wondering if these plugs look normal for a two stroke, and if not what could be causing this. At a very low forward speed, the motor does shake very bad but I have it pretty dialed in to where it runs smooth at idle and wot and no hesitation when the throttle is punched. Do I need to decarb it a bunch more times or do something different? Please let me know,
Thanks guys

 

[ledzeppelin135]

Re: Carbon buildup on new Plugs

Anyone have any suggestions?

 

[ThumbPkr]

Re: Carbon buildup on new Plugs

The Mercury manual says that the surface gap plugs will run dirty like that normally and not to consider them defective.I am not saying that what you are showing are ok since it is only on one side of the plug but that may be because of the short running time.The engine shaking may be fine tuning of the carbs.Ron G

 

[CharlieB]

Re: Carbon buildup on new Plugs

The appearance of that much carbon in that short of time leads me to wonder if the float setting leaves the fuel level just a bit high in the bowls, causing the mid-range and main to run a bit fat.

With the carb inverted, how high/low dis you set the floats?
readjust them just 1/16 inch higher will drop the fuel level, leaning the mixture just a bit. You will have to fatten the idle mixture screw a touch to compensate for the slight reduction in fuel flow.