David - In addition to the advice offered previously here’s a couple more things to check:
1 – Vapor lock. As the tractor heats up from working problem may be gas boiling in the tank and fuel line. (I have a gas Oliver 1600 and a 1650 - both sometimes have this problem when worked hard in hot weather.)
Solutions: Make sure the radiator front is clear to maximize air flow over the engine and gas tank. If the fuel line runs close to the exhaust manifold reroute it farther away, or wrap it in insulation. If your tractor removable hood side pieces around the gas tank take ‘em off. Finally if there’s missing heat shields over the exhaust manifold, or between the fuel tank and top of the engine, replace them!
(Note – you can frequently tell if vapor locking happening by looking in the gas tank filler. If you see the gas is “boiling” – even lightly – it’s too hot!)
2 – Overheating coil (wrong coil installed). If the coil becomes too hot to touch after running 10 – 15 minutes you’ve got a 6 volt coil being fed 12 volts. Either replace it with an internally ballasted coil, or add an ignition ballast resistor in series with the primary to the coil.
3 – Failing condenser (long shot). Could be the condenser goes away as it warms up. For the couple bucks a new condenser costs it won’t hurt to simply replace it.
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