| Spark plug heat range and pinging?
I have a noise in my CAG when it gets hot. When its cold i can rev it all day with no noise but the hotter it gets the worse it gets. To me it sounds like detonation/pinging. I'm running a 5 degree timing key with a head kit with 0.75mm squish. It goes a hell of a lot better with the key so i want to leave it in there and the only option with squish i have is to go to 0.95mm which seems a bit high.
Now i've had a C7HSA plug in there for quite some time and was going to replace it anyway. My question is, is a colder or hotter plug better for detonation? My understanding of NGK plugs is that the higher the number the colder the plug. So i was thinking of going a C8HSA (if they make such a thing). What do you guys reckon? Can a worn plug create pinging? Also what gap do you guys run?
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BIKE:-
None.....
Mods...
None
Future project
Steam powered penny farthing
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