Okk -1 in the front means easier wheelies starting from a lower RPM. Faster acceleration with less top end.
My storry as follows.
My bud Andy, bought a set of Yoshi drop in cams, a grand installed, dynoed it, he had 11 more HP than I did. We did a roll on, he smoked me.
I installed 16t sprocket, we did roll on, I pulled on him all threw second gear. Third gear he started catching up. Didnt pass me until the top of 4th.
Basically that cam had to stretch its legs real good to take down a 20 dollar sprocket. Pretty funny huh?
He was not happy to say the least.
So then he went to 16 tooth.
I dropped to 16/42, didnt hold up as well as I did the first time. About neck N neck in 2nd, but would pull away in 3rd, just get farther in 4th.
Gearing is a very very cool thing to do to change you bike, and its cheep!