Hello Gents, first time on the garden tractor site. Looking for some direction. I have a 2003 Craftsman GT5000 with a 25 hp Kohler Command Pro CV730-0017 that has started using oil (1 1/2 qts in two hrs) and consuming more gas. The left cylinder plug is clean, right cylinder is black and fouled, compression is 155 on the left and 150 on the right. From the research I have done I am thinking it has a blown head gasket. It did use to do the Kohler backfire upon shutdown, but doesn't do it now. Sometimes it smokes on a cold start sometimes it doesn't. I haven't done a leak down test. Begins to lug down when the blades are engaged. Can't afford to have it down for a couple of weeks waiting for parts so I want to order them before I tear it down. Any other problem areas I should be looking at? Thanks for the help.