I'm trying to get the powerhead separated from the exhaust housing on my 15hp. I have all of the bolts out from underneath/engine mounts (9 total) and have disconnected the shift lever as well as all the fuel and electrical lines. From my understanding I should be able to pull the powerhead off at this point but it seems like the gasket is holding the two together. Is there any trick to getting them to separate or some sort of chemical I can use to help dissolve the gasket a bit (if the gasket is actually my issue)?