Wish I knew. I got rid of my 4040 for that same reason. I'd had the 2 speed in the quad range replaced a few years earlier,so I don't think there was a connection. I was chopping,pulled out on a headland,pulled the lever back and it wouldn't stop. I chopped for a few days that was with the lever disengaged and it never even slipped. I talked to the service manager at the dealer,he didn't know. Thought it might be the valve on the side. Said usually when the little arm in the valve breaks (must happen quite often) it won't engage,but thought it must have gotten crosssed up and was keeping it engaged. I bought the parts,went home and pulled it out and that wasn't it. The tractor had a lot of hours on it,it had cost me a fortune to have it split and have the new two speed put in and I wasn't going to do it again,so I traded it off.
If anybody knows what the cause is,I'd sure like to know.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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