One more time...tell me all the reasons that wouuld cause me to exhaust black smoke with this scenario....running my 2GM for a few hours at 2200, normally pushing me at 5.5 kts or so, my speed dropped a few tenths over the next half hour...then when adding more throttle, I got no more rpm, just increased black exhaust. I attempted to clear the prop. and this got me back for a bit, but still had a sluggish throttle and smoke over 2400...whatsup? While I'm at it, why can't those little copper washers do a better job of stopping fuel leaks?