Oily spark plugs

[tuatara]

I use a 2.2 mercury for trolling at very slow speeds. Every 20 mins or so I have to change and clean the spark plug due to it oiling up. Is there anything I can do to prevent this or at least troll for a longer time. thanks

 

[bigbrownbuku]

Re: Oily spark plugs

try a slightly hotter plug.

 

[WillyBWright]

Re: Oily spark plugs

Or less oil. If all you do is run near idle, you can probably get away with 100:1. Don't push the RPMs too far, tho. They need a richer mixture anywhere above 1/4 throttle. They can get by with less at lower RPMs because the burn isn't as complete as at higher RPMs. Less burned fuel means more oil to the internals (and exhaust).

 

[Motor Boater Bill]

Re: Oily spark plugs

Check your carb settings--is the idle mix set too rich? Or is the float set too high? Be careful not to lean it out too much.

 

[Kenny Bush]

Re: Oily spark plugs

Are you lugging the heck out of that motor....?

 

[Qld_Kev]

Re: Oily spark plugs

You could try every 15 mins knock it into nutural and rev it up a bit to burn the **** of your plug. As the others mentioned you could try 1 range hotter plug if you always use it for trolling OR try a bit less oil I wouldn't go past 75:1 just incase you deceide to rev it a bit. What octane fuel are you running, maybe try a lower octane fuel to obtain a more complete combustion. Can you run a smaller/less pitch prop, this will free up the engine a bit from labouring, allowing a couple more revs for the same speed; just be carfull if you deceide to go for a run not to over rev the engine.<br /><br />You may try using one or more of the ideas mixed together.

 

[dolluper]

Re: Oily spark plugs

You can also change the gap from 030 ---to 040 for trolling ,plus a hotter plug at 040 would work well either way change the gap to 040 <br />030 gap is better high speed<br />EDIT: sorry you should alredy have it at 040<br />NGK #BPR6HS-10