stoopidfast

Got a call in to my local Snap On and Mac dealers. Thanks.

Yes, I have a KICK ASS quite aggressive port job from Kevin @ Herr Jugs Racing. I will buy a better compression tester. The Canadian Tire one I have is quite old. Thanks.

Which size ahould I be running? I am surprised at my low compression with those domes. Do I want to go higher or lower compression?

Yes, they do just back out. I know they are not supposed to. I am trying to figure the issue before something expensive happens. I am not sure if it is detonation or some other issue...

They are coming out while riding.

I my having problems with my plugs coming out. I am 4 degrees advanced timing and 18cc domes. Something isn't right though, I thought I would be have much higher compression then 140PSI in each cylinder. Would my altitude of 2165' have anything to do with that low compression. Everywhere I have read, it says detonation is probably the main cause for this. The 18cc domes I have are just scribed in the side, where the 23cc domes I have are stamped. This makes me weary of the 18cc domes. I took the cool head off last night and everything looks good, no pitting or internal damage. Any suggestions or guidance would be greatly appreciated. Thanks.