When the throttle is posistioned on the left handle bar, the motor is running about 4500 rpm and I am in 3 gear, what jets do I use? Do I need to change jets when I use 89 octane, the motor is running at 5000 rpm in 4th gear and going 65 mph headed west into the wind? Sometimes when I am flying to Alaska or Chicago, I have to change jets in Seattle or Mineapolis. But they won't let me take needles on those jets much less change them. Do I really need shins on my needles? I have shins on my legs, sometimes I bump them and it can hurt. I have never tried to pull a vacuum with my bike, does that mean I can't coast down hill on the red line? I hope not because all the lines on the roads are either white or yellow. The pressure I usually get is when they tell you at work tomorrow what they tell you what they want done yesterday. When that happens, what jets should I use? Because it appears to me that the throttle is still positioned on the right handle bar grip and I don't think I should change that. Or should I?