I'm a bit worried when you say "springs" - the later designs have 2 springs, but the 60102 governor only has one spring, as shown in the diagrams I posted. BTW, if I recall correctly the instructions for my engine said you should start and tune that engine with the speed control in about mid-position.

The stuff I post about B&S engines largely comes from the B&S engine overhaul manual. I got it from here:
http://www.tpub.com/content/recoveryvehicles/TM-5-4240-501-14P/css/TM-5-4240-501-14P_78.htm

You can look at any page of the manual on-line, or buy the whole thing either as a download or on CD. It doesn't cover the current series, or any of the Chinese-made engines.