The richer you run a carb the cooler the spark plug,head,piston,exhaust pipe,ect...thus the lack of heat from these items to ignite the vaporized fuel after throttle release remaining in the exhaust system. Running a hotter plug (as I do in most my engines) contributes to this also- there is a fine balance when it comes to jetting,air/fuel mixture screw,spark plug combination and the wanted throttle response for tuning- My Harley is a prime example of this and the lean burning condition I prefer to have the best throttle response. All of my tail pipes run tan/gray due to this tuning method. This habit came from my racing days-
****You have to be careful when doing this to avoid a burnt piston though.****
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