Newbie to this forum

I wanted to formally introduce my mower to this forum. I purchased it around mid July from the previous owner who purchased the HRC216HXA back in the fall of 2012. I originally was going to purchase a used HRX217HXA but decided to get this one since its Honda's top of the line 21" mower. So far, I've only needed to adjust the drive cable but I'd like some instructions on how to adjust the throttle because though its set to high, I suspect its not at it maximum factory RPM setting. Are there any links to a DIY on performing this procedure? I intend to buy a tachometer very soon.