06-02-2019, 10:12 PM
I always use Champion L86C plugs on my High Compression head in the Ruby 3 bearing engine On my 2 Bearing engine with a similar head, I've used the same, but the engine feels harsh, and I'll be going back to the Low Compression arrangement with Champion 18mm H6 plugs which feels better even though the power output is a little lower.
Cheers
Bob
Cheers
Bob