thank you, the guy i bought the motor from sais it sat for about a year i ceaned the carb twice,the oil that was in it was nasty i actually pulled a piece of what looks to be the old dipstick out of the bottom end,when i pull the plug out it is always black as can be would this make it be sluggish on take off? i changed the oil last night i plan on letting it run a while 2day then i will put fresh oil in it again will this help with the plug problem?