Low&Slow, I really wish you would try the 33t sprocket. I ran it with best results @ 14/33 and averaged high 70's to low 80's mpg with stock bodywork and riding it for all it had. I always just used a cheap non o-ring chain on the 250, about 18 bucks. I don't think the little ninja makes enough power to wear out a chain
. I ran the 125 ninja over the weekend and lost close to 10mph with the new gearing, it's way too tall but I'll try to make up for it with a new front fairing (under construction).