Charging control system has failed and is overcharging the battery. Probably the alternator diode, not sure if it's a replacement part on this model, you may need to replace the complete unit.
SOURCE: I have CraftsmanLT1000 lawn tractor, Smokes heavily.
Many times a dirty air filter will cause this on this style of engine. When the filter is plugged, it creates a 'rich' fuel condition, and the engine smokes heavily, the excess carbon is drawn into the air filter, and plugs it even more.
check spark plugs, air filter, fuel filter, choke linkages (for full choke/no choke operation) and crankcase oil.
Crankcase oil can become fuel contaminated, thus overfilling the crankcase and filling the crankcase breather with raw oil/fuel, and this is drawn into the air filter, plugging it, and starting this senerio.
If there is fuel in the crankcase oil, drain completely, and refill with fresh oil. Then you need to look towards the carb for an inlet needle sticking, broken, worn.
I’m happy to assist further over the phone at https://www.6ya.com/expert/rolandw_c013176d62ee17ae
SOURCE: 16 hp lawn tractor won't start; replaced battery
starter cylinoid is bad i almost bet
Testimonial: "Fixed it in now time. Thanks for your help."
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