Well since theres snow on the ground I thought I should get my bike ready for winter. I took out the plug and it was a nice tan color except the ring around the bottom of it, it was a black color. My question is I pretty sure my jetting is right when I was riding it but when I was riding it, it smoked real bad at low rpms but had good response. I'm running 91octane, with torco GP7 at 40:1. any adive for next year?.