If it runs fine for half an hour, it's probably not the carb... Though I say probably hesitantly as it very well could be.
Quickest test for the carb is to choke it a little while it's having difficulty. Half way should be enough - but play around with it. If it improves, then it probably IS the carb... (not getting enough gas through the carb - needs cleaning)
But if it doesn't help - I'd check the coil. That's what I'm guessing the problem is.
I've read janicholson's recommendations here of feeling the coil to see if it's hot. They all get hot, but according to him, almost too hot to touch. I've never felt one like that, but I trust his word.
You can also pull a plug wire while it's running and check the spart against the engine. Look for a good long blue spark. If it's weak, the coil's probably bad.
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Today's Featured Article - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that�s wha
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