I'm stumped. My Cub Cadet 129 will not start. I thought I had a weak spark, so I installed a new coil. The points were too perfect to bother with so I left them and decided the condensor must also be ok. I replaced the plug. The battery was weak so I replaced it. When this first broke down, I was jumping it because of the weak battery, and the voltage regulator must have hung up because for a while the tractor was trying to crank slowly even with the key out. It did this with the ignition switch unplugged too, so I assume there was no problem there. I also checked but found no shorts in the wiring. After removing, looking at , and reinstalling the voltage regulator, that problem went away. I did find a loose head bolt and leaking head gasket, so I replaced that and torqued the bolts ... no help. The only other thing I've done was replace the float because it was sunk a couple of months ago and I had done a temporary fix. Since I was working on the mower, I put in the new float. Now the carb bowl seeps, which is frustrating, but I don't think that is causing the won't start problem. When this all started, the mower was running great. I hit a stick which locked up the mower deck. The engine surged, like when climbing a steep hill. I immediately disengaged the mower deck and shut the key off. It hasn't fired since. I think I have fuel because when I choke it and give it throttle while cranking, the cranking slows and then speeds up when I open the choke and take the throttle down... like it's sort of firing and helping the motor turn. Also ... without even running the new plug is extremely carbon fouled. (That's why I checked the head gasket.) I've rebuilt this motor twice, so I know what really broken sounds like, and its nothing like that. I'm out of ideas, its been a week, and my yard is starting to look like a jungle. I'd sure appreciate any suggestions. I'm sure I'm missing something obvious.
Thanks
Tom
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