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Old 01-25-2013, 12:35 AM   #31
Beastly Adventurer
Joined: Feb 2006
Location: Bath Uk
Oddometer: 2,301
If your airhead is dual plugged, use a hotter running plug in the lower position, because the hotter running plug will help burn off the oil etc that tends to end up on the lower plug, so with NGKs I might use a '7' in the top and a '6' on the bottom.
R90s 1070 replica, R90/6, 1958 R50
1971 Commando Fastback
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