spark plug oil leak

Have any of you guys had this problem? The stock chinese GNT plug didn't have this problem, but the champion & ngk plugs both leak around the seal (ran like **** with the champion L86C, but it might have been a gapping problem). And yes, it's tightened all the way down. It doesn't feel like the fit is sloppy or anything. Do you think it is safe to use permatex on the threads of the plug to stop the blowby?

should there be one of those compression washers on it. I can't imagine oil collecting without a loss of compression in the cylinder

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visit my blog for Riding in the hood,... The home brew bike journal....http://frictiondrivebicycles.blogspot.com/ The deacon's fiction

Yes, there is a compression washer on it, but oil is definitely getting by it. And it looks and feels like the plug is completely seated. As for compression loss, I really can't tell. The motor is still in the breakin stage, so I've been attributing the lack of power to that. It runs pretty crappy for the first few minutes, then gets better as it warms up. I get about 2/3 - 3/4 throttle ok, but it loses power at full throttle. I have to back the throttle off to get back in the power band. Plug looks good, running 30:1 synthetic. I've just been figuring it still needs to be broken in. I did notice the head was leaking as well, but I fixed that. Had to put a couple washers on the studs so it would tighten down. Still trying to work out the bugs

You know with the price of spark plugs I would just go to the auto store and try a different one. It could be something wrong with the plug. That would be my first guess. Fix the easiest things first. If that doesn't do it move on. I don't think my plug has a compression washer. Some where on here is a list of compatable plugs. Try a search, if you cant find it let me know and I'll try.

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visit my blog for Riding in the hood,... The home brew bike journal....http://frictiondrivebicycles.blogspot.com/ The deacon's fiction

here is one that they recommend


NGK B5HS works great and they are inexpensive or maybe you could try the next range cooler B6HS, but supposedly the Chinese stock plug is equivalent to the hotter B4HS...which I don't agree with....but the stock plug is slightly different than the NGK in construction and electrode tip length.

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visit my blog for Riding in the hood,... The home brew bike journal....http://frictiondrivebicycles.blogspot.com/ The deacon's fiction

Don't know about your motor but 30to1 sounds wrong for break-in, from every thing I've heard 16to1 is what you need in order to get the rings to seat. That's for the first gallon or so. Give Pablo a shout, he's up on all the oily stuff.Walter F.

I've got the NGK plug in right now, but I guess I can try another one. I just figured that since both the NGK plug & the champion plug leaked...ARGH! And I ran the first gallon at 20:1, just for clarification. I'm still on my first tank of 30:1.

I didn't realize you had two plugs that leaked. I have no idea what it could be. You said the plug was tight and there was no visible signs of exhaust leak around the plug except for the oil. I just don't get it.

It sure does sound like an exhaust leak there. You know the exhaust pipe leaks oil. You might ask at the auto parts store if there is a sealant that wont hurt the plug to use on the threads. Some anti seize stuff might help keep the exhaust from seeping around the plug but that doesn't sound all that reasonable either. Ask Norman in a private message and let us know.

Im going to send norman a pm and ask him to take a look at this thread.

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visit my blog for Riding in the hood,... The home brew bike journal....http://frictiondrivebicycles.blogspot.com/ The deacon's fiction

Hmmm.... Thier might be a problem with the head thier that you are not getting a good seal between the plug and the head...It is a good ideal to use some thread anti-seize on the plug

A pic of the head with the plug out may help to see what's going on

I'm kinda agreeing with this. Nothing should be a-blowin' past the plug. I would get a new head gasket and then take the head off (spark pug first), and carefully check the plug mating surface.

Should not matter what the oil mix ratio is.

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