Update, After watching the NGK BR9HS not turn color I installed a #84 Main and then an 86 Main. Then with the Needle back to the 4th Position I Finally soe a little color at the Bottom of the Plug. The crazier thing is my last tank I got 81.1 MPG and Part throttle is very good. The only adjustment I keep making is the Idle AIr Screw for the different Temp ranges. It had been between 65 and 105 degrees and you never know when it will rain! I cannot believe how well you can make the 17,5 Dellorto work using all of the 14 mm stock parts!