I have a 1997 Yamaha XT500 have owned since new and only has 2800 miles on it. It typically starts in one or two pulls. Idle seems ok but does sound a little different to me. Last year I did have a sticking TORS issue on carb but was fixed. Sled is running but just seems to have less power on low end. When it hits 5600-600p rpm it sounds more normal. I am getting horrible gas mileage. Went 26 miles and used 7 gallons of gas. What used to take a 1/4-1/3 of a tank takes a whole tank. I do not smell any gas or see a leak. I pulled plugs and they do seem a little wet even though it is running. Any clues?? Only other visible things I have seen is what appears to be dark syrup looking oil between manifold and cylinder. Possible bad gasket? When I pulled plugs lots of smoke coming put of cylinders.