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Oil coming out of spark plug hole
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Oil coming out of spark plug hole - March 29, 2010, 05:48 PM

Alright, I finally got around to trying to find out where my bike is leaking oil. I was thinking it was one of two things. The pair valve plates, or the front cylinder head gasket. What I found after pulling the fairing and plastics off is that the oil is actually coming out of my spark plug hole. Someone explain how this is possible. I'm pretty sure it didn't leak into the hole. I can't find any other place that looks like it could be coming from to leak into the hole.
When I pulled the spark plug boot out, oil flung out at me. This is where I'm at so far.

It's on 03RC51 with 17000 miles. The bike runs fine, minus the oil leak.
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March 29, 2010, 05:52 PM

shot piston rings

post pics - I would like to see this. Or post a vid of you pinning the throttle for a long period of time.
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March 29, 2010, 05:54 PM

I'm guessing this thing is blowing smoke also?


"Start where you are. Use what you have. Do what you can." - Arthur Ashe
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March 29, 2010, 06:06 PM

you see oil on top of the plugs right? around the boot? or when you remove the spark plug tip is coverd with oil?. if th the oil is on top the plug and the boot area its the valve cover gasket. thats what i think, may be im wrong i am not familiar with your motorcycle.


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March 29, 2010, 06:12 PM

The bike wouldn't run with so much oil in the cylinders, not to mention there is no way to get oil passed a properly tightened plug. I second the notion that the valve cover gasket is leaking. Or it's possible that the bike spit some oil up into the air box via the crank case vent, and the oil seeped out onto the head and down in around the spark plugs. That can happen because of overfilling or blow-by. The valve cover leak is not uncommon on an older bike.


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March 29, 2010, 06:30 PM

valve cover gaskets. Enough blow by to coat the plugs like that would mean major smoke and poor running.
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March 29, 2010, 06:30 PM

It has to be the O ring seal on the gasket around the spark plug. No the bike, does not blow smoke. The guy I got it from had the 16,000 mile valve check done not that many miles ago, so I'm thinking that is it.
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March 29, 2010, 06:32 PM

No blue smoke, no oil blow by, no bad engine (at least from that standpoint).
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March 29, 2010, 06:33 PM

Valve cover gasket is a misnomer, its actually the spark plug gasket, but you tend to buy kits that contain both, or all 4 in your case. Ive had this happen on both a bike and a car. Its easy and cheap to fix.


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March 29, 2010, 06:36 PM

SWEEEET! Cheap to fix. I like to hear that. Now I have to have Phil, or somebody, that is willing to come help me do that. I'm sure I could do it, I just would feel more comfortable with someone that may have done that before there helping me.
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March 29, 2010, 06:39 PM

This would definitely not be the first time a shop did a valve inspection and did a poor job putting things back together.


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