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I'm only hitting 7860rpm on my CARB M7/800 BB. I have replaced secondary spring with new, bushing on secondary, tried 2 new belts, cleaned PV's, adjusted cables, down to 63g weights in primary, adjusted compression adjuster (06 10") on secondary .59" in and also has shift assist. Possible that it's lean?? Plugs look grey. Any help would be appreciated.