Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

I've got a Briggs and Stratton 6.5 HP engine on my mower. It's a 1997 mower, with engine model 110600. Anyway, last summer, everyone here helped me find an oil leak, which involved pulling the head, and replacing a gasket. It's working fine now, but seems to have a lower amount of power. Generally runs fine, but just seems to be running with less umph.  Since i had to take off the linkage to pull the head/carberator, I'm wondering whether I messed up an adjustment..

Anyway, on these little engines, is there a throttle adjustment? I want to get as much power/RPMs out of the engine as I safely can....

Any suggestions or leads to what I may be able to look for?