OK I'll fess up I have a 25 hp kohler, up to now I havnt had a problem at all, I also have 2 15 hp one lungers. My 25 hp has 205 hours and today it sounded like the lifters started tapping. I use 10-30 synthetic blend castrol,and just changed the oil at 190 hours. It wasnt low on oil and had a few hours on the change. The kohler guy said could be a bad filter, I changed oil again today, no change. I dont want to be bashed for owning a kohler, Kawasiki parts take weeks to get here if they do break down. There arnt that many kawas around here other then deeres and if you dont have a deere they dont want you shadowing their door. Does anyone have any ideas ???