Hello and thanks in advance for any information. I did search before posting but couldn't find anything to help me with this particular issue. I have an older Crastsman LT 1000 riding mower with the Briggs Intek 20-hp OHV V-Twin. The mower was not running when I got it, but I got it to run well after changing oil/filter, replacing the battery, spark plugs (gapped at .30), fuel line, and cleaning the carb multiple times. It was running perfectly - choke knob operational, throttle lever (slow-fast) working properly, charging system good, etc. I used the mower for about 20 minutes to cut part of my back yard and it worked great for that time until the end. I dropped the speed to idle and put the mower in neutral to move a few things in the yard, and when I did that I noticed the idle was surging up and down, which it hadn't been doing before. I wanted to finish up so I put it back at full throttle and it seemed to be working properly (was no longer surging). I was mowing at full throttle when all of a sudden the engine seemed to over-rev quite a bit faster than it was already running at while set on full speed on the throttle lever. At the same time it did that I noticed some sparks shooting out from the front near the muffler. Tried to throttle down, and the throttle lever had no effect. Could not get the throttle speed to come down at all, so I shut it off and let it cool down. Upon restart it immediately goes to over-revving again, with the throttle lever having no effect up or down. I checked the linkage on the end of the throttle cable and it moves back and forth when I work the throttle lever up and down. I'm guessing that the throttle cable is going to some kind of a governor, because it doesn't attach directly to the carb but rather to a cylinder type thing which is under the carb. It's dark out so I haven't had a chance to investigate further but I need to get back on it in the morning. Any ideas?
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