I'm sure there must be a thread on this subject, but I couldn't find it, and I'm sure I'll probably get lots of different opinions, but what is the best plug for a mildly tuned twin, (8.5:1, 32 mm Mk1 concentrics, Mk3 cams, points coil ignition) for general social and touringish use?
I seem to be in a time warp, my Egli engine is more or less as it was in the 80s the current plugs are low mileage Champion N9Y, I seem to remeber using N5 and even N3 before settling on them, and I'm fairly sure they were used for everything from camping trips to Spain to High Speed Trials at Cadwell. The engine starts easily and runs well, but if there's a modern plug out there that will give me another 10 bhp or 10 mpg I might change.
H
I seem to be in a time warp, my Egli engine is more or less as it was in the 80s the current plugs are low mileage Champion N9Y, I seem to remeber using N5 and even N3 before settling on them, and I'm fairly sure they were used for everything from camping trips to Spain to High Speed Trials at Cadwell. The engine starts easily and runs well, but if there's a modern plug out there that will give me another 10 bhp or 10 mpg I might change.
H