I've always adjusted small engine idles by ear..... but i finally decided to buy a tachometer... it came in the mail today so i tried it out on the mule. it's the kind that wraps around the plug wire.
fire the mule up, the idle RPM spec in the manual is 1,300... and the way i have it adjusted now it was idling at 1,260, let it warm up and bumped it up to 1300, which wasn't much