Are you jumping with a 12 volt directly to the starter? Do not jump a 6 volt battery from a 12 volt!
A new charged battery should turn the engine over really well. If not, there is a wiring problem between the battery and starter (switch, cables, etc).
Once the wires and switch are OK, the generator should keep the battery charged. If not, there is a problem with the generator or voltage regulator. A volt meter is your friend.
The engine stopping after a couple minutes sounds like a fuel supply problem between the tank and carb (the carb bowl runs dry), but it could be a bad coil. Even with a bad coil I've never seen them run less than 10 minutes. You can tell if it's the coil by feeling it when it stops. After only a couple minutes it should barely be warm. If it's hot hot, replace the coil and see if it keeps running. If not, a fuel line and carb cleaning is in order.
Sounds like the starting problem is electrical, and the stopping problem is probably fuel supply but could be electrical.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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