.....and I'm wondering if the mechanic did what he was supposed to do. He put a new carb on it. While I was there we fired it up, of course. Seemed fine, but it was weird for me because I had been running my 15 hp Kawi belt drive (backup) for more than a couple weeks staight & sorta got use to it. The sound of the engine, etc., which is like brand new and very smooth. When I was at his shop picking up the mower I asked if he went ahead & adjusted the valves & he said "oh yeah, I did since I had the cover off....even though it's not on the invoice." Then - - he hand wrote it on there. When I got the machine he put the carb on back in the field it seemed to me the engine had some knock or tapping. I only did one job with her & parked her again. The mower seemed to bog a little in some taller grass. The 15 hp kawi I have did not. So what do I do? I feel like another trip to a different mechanic is in order.