fuel and air mix

I got an '09 FZ1 (roughly 30k miles) a couple of months ago and it has been getting absolutely terrible fuel economy. I get about 70 miles before I get switched to F-Trip, which is (70/3.8 = 18.4 MPG). On deceleration, the bike pops a ton, and I think this may be more than normal, maybe like...

Ive noticed a rich exhaust smell coming from my bike and I wanted to know how to adjust the fuel air mixture on the carbs. I bougth the bike used. The previous owner installed a Dale Walker Performance kit Stage 1 which I think consists of a timing advancer, bigger jets, and exhaust. The bike...