"......it pops and......" Popping is exploding fuel in the intake area of the engine. Timing is incorrect causing the explosion to occur while the intake valve is open...even a little. Anything that affects timing is suspect, not carb issues. Condensers yes, valve train adjustment, cam wear, distributor alignment wear (all as stated by others) can be suspect.
The purpose of the condenser is to control the rate of rise and amplitude of the spark that occurs/would otherwise occur across the points as they open (generating the high voltage pulse to the plug) to prevent arcing, thus extending the life of such......early engines of the type didn't even have one.
The engine will run for a time (early point damage) without it but the timing will be off slightly as the capacitor/condenser delays the leading edge of the opening "effect" of the points. If you suspect the condenser, remove it, loosen your distributor and by hand rotate it back and forth slowly to see if you can get the tractor to run right. If so, it could be your problem....as long as it wasn't distributor wear or igniting timing set incorrectly related.
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