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I have Harley open pipes running 130 mains and tuned for highest idle but. No airbox mods at all.
If you haven't pulled your snorkels from the airbox, you should try. 130 mains should be good with the pipes and airbox snorkels removed. You might want to install a shim or two under the needles because you will probably notice a flat spot mid throttle.
When you pulled the plugs, what colour were they?
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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