Most hours are from mowing. Finally got around to putting the bar tread tires on, supposed to get a bit of snow this weekend, so I can see how they are compared to turf tires. The throttle issue came up again when I started it up to change tires-good thing I did start it. The throttle springs back to idle, not able to pull throttle down and have it stay, same as what happened before. I investigated it this time, as I can't hold throttle and run the loader and steer at same time.... I took the mesh cover off under steering wheel- the throttle lever has a nut on bottom, compressing what looks like a couple washers, which is what holds the lever in position- I was able to turn nut by hand, so it had worked itself loose. A 12mm wrench tightened the nut up, and I decided that was last time it was gonna loosen up on me. I went to Home Depot and tried to guesstimate size of nut I'd need- closest to a 12mm wrench, but just a wee bit bigger was the M8 nut, so I grabbed a few different M8 nuts. It was a M8x1.25 nut, I used a nylon insert locknut, which needed a 13mm wrench. All set now...