i'm not adjusting them yet...i probably will not adjust them until after the 2012 season depending on how many hrs i mow this year. i just like to be prepared ahead of time. i will not adjust them until 300hrs. at that time my mower will no longer be under warranty i dont' think. it's not really about that it's just i don't trust people. i mean when i bought the mower i had them adjust the air intake hose connected to the carb so it wouldn't vibrate against the metal piece on the back of the mower possibly causing a hole in the hose over time. i watched them adjust it before i bought the mower. they did fine but they forgot to tighten one of the bolts on the metal piece back down. (they had removed it to get at the bolt for the hose better) it's just little mistakes like that. who knows what little mistake they could make while working on the engine? the reason i asked about where to get a feeler guage is because i've never bought one before. i've never used one either. i don't think we've ever had the valves adjusted on any engine we've ever owned and we've never had any problems. so who knows? anyways i'm remembering seeing a feeler guage before in my dad's garage. if i can find it i'll just use it. i may practice on my pushmower first since the valves on it have never been adjusted. most feeler guages go as small as .0015 like ridin' said. i figure i'll use .003 since it's right in the middle of the recommendations. i hope it doesn't have some sort of star bit or special type of bit to adjust them. i hate that kind of junk. they try to make everything where you can't work on it yourself nowdays or you have to buy some special tool. i hope it's like the honda engine in the video and i'm able to use two wrenches to do it. has anyone done theirs and know what you use on the kawi fx engines?