Bad seal. Buy a Seal kit some threebond 1194 and get into it. Not much to look for other than a spot missing case sealer. This shit is bad! See some other post of Twister Motors RUINED by too much sealer, lots of this stuff is runny. The Threebond 1194 is not to bad, Get a palstic syringe so you can put a controlled amount on when using. I bet I got enough in 1 tubr of 3 1/3 oz. to do 100 sets! You want just enough to make a little bead come out all the way around. Little, mine is like 1/16 or less all the way around. It don't take much and this way is SUPER clean! Good luck!