2007 90HP fouls the plugs at low idle

[Old No 7]

I have a 2007 90HP Mercury 2 stroke motor. It runs fine when wide open, but I have a 10-15 minute ride out from my marina before I can open it up. The motor runs terrible.. spits, caughs etc. On the trip back in it runs fine for a few minutes, then the plugs foul and it starts all over again. If I pull the plugs I can see a little oil on them.

As this motor has a built-in oil feed, could it be feeding too much oil?

Is that something you can set or is it fixed?

Something else maybe?

It's not a real problem, just annoying.

Thanks!

 

[Don S]

Re: 2007 90HP fouls the plugs at low idle

Check the oil pump timing marks at idle. It could be off and injecting too much oil into the fuel which will foul the plugs.