Thanks Chuck, I removed the air filter housing and did some cleaning with carb cleaner. The air flow sensor? (large round air intake) was very gummed up. After a good cleaning, I could rev it up to about 2000rpm. Squirted some cleaner in the vacuum lines of the warm up / acceleration regulator. Was able to rev it up to 3000rpm. Is the vacuum fitting on top a vent? Or am I missing a line somewhere?

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