mkirsch makes a good point. The fans on these engines make more noise than the exhaust and, if you're not used to workin' around them, intuition won't always serve ya well when guessin' how fast they're runnin'. So I'd agree it'd be best to get a tach on it before gettin' into the guts of the governor or the main adjustment screw on top.
The springs on the linkage rod from the seat to the governor are more to do with how quick and how hard the governor responds to a load goin' on and off, and I don't think they're the root of your problem.
Before adjustin' or gettin' into the governor itself, try adjustin' the linkage to synch the carb to the governor. You'll see a rod coming forward from the throttle on the carb, with a clevis threaded onto the end of it (should also be a jam nut up against the clevis bit it could be gone). That's held to the governor arm with a pin through the clevis. Remove that pin and clean up the threads on the throttle rod if they need it.
With the engine off -- throw your speed control lever back at the seat all the way forward. Go back to the left side. Hold the arm from the governor and the throttle rod to the carb both back as far to the rear as they will go. Holding them in that position, thread the clevis whichever way it needs to go so that the pin will pop back in to hook it all back up.
Apart from the spring breakin' or a thrust bearing givin' out, governors don't usually require regular attention. Adjustments for wear are usually minor and far between.
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