Yamaha..oil around spark plug

Post by GC » June 30th, 2004, 8:49 am

I've seen it on two Yamaha engines now, and I'm getting a little concerned. The plugs are in tight, torqued to specs. If you run it for a 3 or more hours, there'll be a small amount of oil that has run out from around one plug. It's always the same one. Nothing big, it won't even run enough out to make it down to the next plug located directly below it. Just wondering if any of yall have had the same problem?? What should I do??
I've cleaned it off and run it on the hose and can't get it to leak.....but after a days worth of fishing....there it is.

Post by **Atticus** » June 30th, 2004, 12:43 pm

What year/size Yamaha? Has a plug fouled yet?

Post by GC » June 30th, 2004, 1:34 pm

1) 2002 Yamaha 150, 2-stroke

2) 1995 Yamaha 25, 2-stroke

none of the plugs are fouled. Both run great, no problems, except for the oil!
I did flood the 150, once,

but other than that nothing.
I have kept an eye on the amout of oil used on the 150 and it's completely in the normal range. It's under warranty, so I'll probably just take it in.....I was just wondering if anyone else had seen the same thing!

Post by **Atticus** » June 30th, 2004, 1:47 pm

I read on another board about something like that happening to bigger, more recent Yammies

Post by **tin can** » July 3rd, 2004, 5:13 pm

Do the plugs have the metal seal washers on them? If so, change that plug and see if the problem goes away.

Post by GC » July 6th, 2004, 12:03 pm

They do have the metal seal washers. I believe that's what the problem is! Thanks TC!