Hi guys, thanks for taking the time to read my post. A month ago I bought a 2004 Lazer Z 60" AS. It was a craigslist basket case but for $800 I figured I didnt have much to lose. Machine has under a 1000 hours. Previous owner told me he burned a valve on the "left" side as you stand behind it. He repaired it and kept mowing ( he was a residential user.). Mower starts puking oil and loses power. He runs it until it wont run anymore. I tear it down. "Right" side has burnt exhaust valve and blown head gasket. I Lap in a new valve and put togather with new head gasket. Machine starts easy and runs great. Tons of power and not much will slow it down. Changed the oil..2 quarts of Valvoline 10w30 and a napa 1348 filter. Starts to smoke some. Smoking gets progressivly worse and goes through 2 quarts of oil mowing my 2 acre lawn. It eventually fouled the plugs. The Left bank was worse then the right. It was also pushing oil out both crankshaft seals. I thought I had the excess crankcase pressure problem fixed with the head gasket. Cylinder on the right looked good with no ridge at the top, even the original crosshatching was visible if you looked hard enough. Compression was 150 and 160 left to right. The only thing I havent checked is the breather and reed valve I hear people talking about. What do you guys think?