I'm just curious. Can you or have you pulled the spark plug and see what the bottom of it looks like. Whitish will be running lean. A golden fawn almost coffee color is just right and black is to rich. Will tell you alot about how it's running. Sounds to me like the transistor from idle jet to high speed jet isn't quite right. If you havnt done it go ahead and give the carb a real good cleaning it wouldn't hurt since ya really don't know of the service record
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