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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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