I am test running my motor in a barrel, and it will not rev with the cover on. As soon as remove the cover it seems to run out a lot better. I think running the motor in a barrel causes it to suck the thick smokey fumes through the intake and run poorly. However, I can run other motors in the barrel and it doesnt seem to affect them. I just replaced the plugs and cleaned out the carb. I am also running a can of Sea Foam in the 6 gal tank, so that may aid to the smoke. The motor will start and idle perfectly. So i am wondering if I was on a lake and moving if I would have the same problem or if anyone else has had this sort on thing happaen to them?