Jetting without a dyno and proper air/fuel testing stuff, is a guessing game...
Experience,.. seat of pants testing,.. and inference...
You can get the main right with the 1/8th throttle drop... keep testing with bigger jets 'till the up-surge is gone...
Adjust your needle jet in relation to that,... roughly... if you go up a step or two on the main... reduce the spacer for the slide to 2/3... if you need more main,.. reduce the spacer more...
Adjust the pilot with that in mind also,.. but... the pilot is less critical, because you aren't stressing the engine at those rpm's... so, ere on the side of smaller with the pilot, as long as you can still adjust idle with less than 3 turns from full closed... This will help with gas mileage and won't hurt the engine or performance...
Maybe I should add this to the tuning post I did?..
...
(I'm actually just realising that I contradict myself, somewhat)...
You
should do jetting from bottom to top,.. because each step affects the next... idle mix, pilot, needle, main... additively...
...but, to get a base point.. I'm testing the main, with the throttle drop test... then adjusting everything below from there...
... but, once you make those changes, you need to test the main again...
Because, the pilot and needle have affected the WFO total...
I will make some changes to the tuning post...
I was stating proper procedure, as I have been taught... but, I realise now,.. that's not really what I do...
I say,..
... test the main, then adjust the other circuits proportionally... then retest the main...
It ain't easy...
... and I judge my work, by observing how the bike behaves in humid weather, or at higher elevation... in those circumstances a well tuned bike, should start to pop just a little.. that's a lean pop.... and your well tuned bike should start to pop a bit when it's overly humid, or when you elevate more than 5k...
I'm sure I add more confusion than clarity.... Sorry...
Jetting is tricky... it's never right,.. just pretty good... even with pro equipment.. because the elements change day to day, and ride to ride...
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