My kohler 22 has had a problem since I got it. Sometimes when I crank it the lifters will tap for 5 or6 minutes before they ever pump up. I told my daler about it early on and he said it was common for them to rattle for a few seconds but eventually they would quiet down. That ain't whats happening! He also said the engine was warrantied for 2 years so if there was a problem Kohler would take care of it. Anybody else have this problem?