I bought the bike used and it came set up the way it did. It has a complete engine job by Bills pipe. I thought the same as you when I bought it so I tried leaning the bike out a little. The bike did not like that. The engine would start pinging at high load and higher rpm. I tied adjusting the needle up and down and changing the pilot and Main. Ended up going back to how the bike was set up when I bought it but went from a 50 pilot to a 48. So I have it setup the way Bills had recommended but a slightly leaner pilot. The pipe is short its sits behind the side plastic. The way the bike is now it runs excellent. I've been riding on the same plug for the last year. So I cant have it set up that bad. I ride about 4-5 times a month.