Plug blow-by?

[SXIPro]

I seem to be blowing oil past my plugs onto the top of my head on one cylinfer of an ADA racing head with 33cc domes. I've tried several new spark plugs, but same deal. Should I worry? Can this be fixed with a helicoil or something? The plugs tighten up just ifine. :eek2:

 

[SXIPro]

ttt

 

[snowxr]

Are you sure it's oil? Maybe your o-ring at the top of the dome is leaking? Just a thought. The spark plug has a crush washer that should seal around it's base, so I doubt anything would leak past that if it's tightened properly.

 

[Scorn800]

If your plugs are loosen up you have deto. Isn't that what blew up your last motor?

 

[restosud]

the new sealing washer on a plug should seal that if the threads are good and the plug torques up .
unless the recess is chewed up or the dome is cracked.

 

[SXIPro]

If your plugs are loosen up you have deto. Isn't that what blew up your last motor?

Plugs are plenty tight. My motor croaked because the guy who owned my ski originally put the primer fittings at the base of the carbs, not up top where the choke plates were. My primer went bad ,caused an air leak and BLAMMO.

 

[Jayski]

If your plugs are loosen up you have deto. Isn't that what blew up your last motor?

not allways the case i beleive high comp can back out plugs, can they not?