The pilot system meters fuel ratio from idle to 1/4 and a bit beyond as you probably are reading. In order to check correct jetting you need to warm the bike up to full operating temp. then adjust the idle screw to raise the revs to 1500- 1800 rpm. This causes the pilot jet to be in full operational use. Then you need to screw the air/fuel mixture screw in both directions till you hear the motor start to run poorly in both directions. The whole time counting the revolutions between the two spots. Once this is determined, the spot halfway between them should give good running.
Now once this spot has been found, you need to count and screw the needle all the way in. If the amount of turns is greater than 2 you need go down in jet size. If the amount is less than about 3/4 turn go up.
Now you can start to see where were going with this. We want the jet to operate correctly within a range only 1-2 turns out. Many of these motors are jetted and tuned way out. This is the first step to take for all those guys who really want to get rid of that bog off idle or to fix the instant throttle opening problem. You will be surprised how much acceleration you will gain on your mates with the bike pulling off idle with crisp throttling.
Then you start to look at your main jet. You want, once again, for your needle to either be set on the middle clip or one down or one up. If you need to have your needle at the very top or bottom setting, then your main jet is wrong and you need to go either up or down in main jet size.
