3600 does sound high, what kind of tach are you using? I am think about getting one that uses a laser where you have to place a piece of tape on the shaft. Might need to get a service manual for your particular model, I think my M series runs at 3100 to 3200 and pretty much the same for my dura-force.[/ is an
My tachometer is an Echo PET 1100, I checked with both non contact and with the antenna jack on the plug wire and got about the same reading 3500 -3600. I agree 3600 seemed high so I revved it down a bit when I mowing with it, I was just checking what it's max was with the carb settings as is. I have the original paperwork, haven't looked at it. Might not have that kind of detail. I'll probably just leave it as is and run it where it seems comfortable. Thanks again.....Ed