Does turning the air screw all the way in disable the pilot jet effectively?
In other words will the only gas air provided to the engine come from the main and the slide?
Want to test the main and needle only....will that work?
this is how a carb works.. pilot jet: from idle to 1/4 throttle turn. needle from 1/4 to 3/4 .. at full open: main jet only .
any turns on the airscrew effects only the pilot jet. is the screw 2,5 -3 turns out you need the next richer pilot jet. by less than 1 - 0,5 turns the next leaner pilot size.
the needle does the main work in performance.. by to rich you have to lowering the needle to get in leaner position.
if the needle has reached the highest clip-position, and engine is still to rich, you need next leaner needle. (example: n82m is in, then comes n82n )
has the needle reached the richest position (lowest clip position) and is still to lean, comes the next richer needle (in this szenario the n82L )...
by changing main jet never go bigger as 5er steps ... example: 170 is in and to rich you could try the 165 to get leaner or 175 for the other case of to lean.
do always test one of this things to come step by step to the perfect jetting.
always with warm engine, and in the conditions,where the bike should used.
make also sure that the airfilter is clean and oiled in the right way and also that the right gas is in the tank best premix is 1:40 with motul 800. in my eyes the best 2stroke-oil thats available to the public.
i ride only 98 or 100 octane (called super-plus here in germany)