This is a 60 jet, it's way too rich IMO. The 58 is a little better, and the best all around as far as top speed, the 55 even cleaner, but cant flow enough to support higher rpms. This is the way its been with all oil types I have tried. Walmart ST, Echo, HEB GTC, and one or two other off the shelf gas station bottles. All ran at around 32:1, except the amsoil, at 95:1. This is after a 6 mile ride roughly. I'd really like to have a nice milk chocolate brown, but I've never seen it on this particular engine. The needle has nearly always been set at the 2nd notch, I couldn't ever get any decent adjustment to my satisfaction through the needle. I did try moving it around at first before I ordered a jet set.