Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hi, when you had the carb apart did you blow all the passages out with compressed air?
It's very likely the carb cleaner pushed debris out and that's what the current issue is. I would pull it back apart and soak the carb for 10-15 minutes in a commercial carb dip, blow all passages with compressed air and reassemble. This will remedy any further debris clogging the jets.
If an air passage is clogged it will do that, the jet being clogged will cause it to run slow as it did at first.
That's pretty much it, as long as the linkage moves freely for the governer to control overspeed it's in the carb istself. Good luck with it and thanks for using Just Answer!