Reddit mentions of Sportbike Suspension Tuning

If you're looking to tune the suspension on your stock bike, I'd suggest making sure that you first understand what you are about to do. I like this book a lot:

http://www.amazon.com/Sportbike-Suspension-Tuning-Andrew-Trevitt/dp/1893618455

Adjusting the pre-load for your weight is likely the most important tuning that you will ever do on a bike intended for casual riding. Depending on how aggressively you ride, you'd probably be completely fine if you never touch any of the tuning away from stock settings.

One suggestion that I will make is to make sure that you have the rear brake configured so that it's difficult to lock up the rear tire. When I got my monster, I felt like the brake lever was too high up and adjusting made using the rear brake feel better for me. Your manual has instructions for adjusting all of the controls.

http://www.amazon.com/Sportbike-Suspension-Tuning-Andrew-Trevitt/dp/1893618455

tuning suspension is a lot harder than tuning a motor or really anything else on the bike to get right. I do not tune my own suspension nor do I know much about it, but I do know you do not set 'sag' on the front forks you set preload and that is based on the springs. Also 5 inches of sag seems like a LOT in the rear. You should read a book not make a thread I'd suggest this one:

http://www.amazon.com/Sportbike-Suspension-Tuning-Andrew-Trevitt/dp/1893618455/ref=sr_1_1?ie=UTF8&qid=1422042366&sr=8-1&keywords=suspension+tuning+sportbike&pebp=1422042392314&peasin=1893618455

your dad has no idea what he's talking about. if a bike had no suspension, it would have no grip, be sliding everywhere (and crashing), and absolutely destroy its tires. you should read this book if you want to know more. it's not very long and is pretty simple and easy for a beginner.