Our new 160Z we got this spring has the 25hp kohler. The engine runs very strong but its now smoking like a freight train every time its started. It smokes non stop at idle and at full throttle it smokes for about a minute then clears up. Its still burning oil at full throttle because you can smell it but you cant see it. I did a compression check and both cylinders are right at 170 pounds. The left plug is oil saturated (its on the left of the carb when your looking at the carb from behind the machine). The right plug looks normal. Anybody have any ideas? I am thinking it could be. 1. Blown head gasket 2. torn or broken intake valve seal 3. cracked ring 4. sticking reed valve With the compression normal in my mind that throws out the head gasket. It didnt smoke when new. Started a little at around 30 hours and has gotten worse and worse to the point i am about to throw on a new blade clutch on our old lazer back up machine and take that to work today.