I can't seem to find the happy point on my jetting. It's either too lean or too rich. The factory recommend settings are too rich and cause me to foul plugs regularly. I've tried going up a notch on the needle. Plug looked very nice but started hearing a little bit of detonation. It's like I need a notch in between the 3rd and 4th setting. Current setting which is too rich but, what is factory recommended: 165 main 35 pilot N2ZK needle on 4th position gas mix is 60:1 - 93 oct. with motrex Any suggestions?