Have a mower with a 2002 year B&S Quantum 6.5-HP, The engine runs nice and smooth problem is it seems to be running to slow I would like to increase the RPM I do not see any adjustments on the Carb.
Remove the air filter and you will see a tang with the governor spring attached. Gently bend the tang to put more tension on the spring. This is best done with a tach, don't get carried away and cause the engine to grenade.
I do not see a tang, I did move the spring to a small hole that was a bit further out ( more tension on the spring) this has increased the rpm a bit.
I have had a lot of mowers brought to me for repair, where people tried to "increase the RPM " by tinkering with the governor. I pointed to the hole in the crank case and told them to buy a new mower. Most of these engines are plain bearing engines (bushings everywhere) they cannot tollerate anything above 3500 rpm.
The mower shop will check with a tach before adj RPM
If needed with charge 10-12 for the 10 min this takes.
See the posting on this page titled:
"idle very high with no adjustment"
There is a picture there.