I am ordering #130 jets from www.parkeryamaha.com online this week. The K&N filters I got recommended going up 10-12% in jet size and raising the needles. The bike comes #115 jets. I first ordered #120 jets before I realized they would be too snall (and they were. I took my old #115 jets and drilled them out to 1/16 inch and tried that. The bike ran great except for a little hesitation when first turning the throttle. I am ordering the #130 jets to see if they are better. I bought my bike new in the box in 1985 (it wasn´t a hot seller in 1982).