Crf150r aftermarket airscrew 

The larger O ring fits on the screw shaft closer to to the adjustment knob. If you look carefully there is a slight groove in the screw shaft. It is there to keep dirt out of the opening of the hole that the fuel screw goes into.

That big washer don't go

Did the new fuel screw work good even though the dimensions were different?

How many rounds should i screw it out?

I've bought the same thing and I'm having trouble

I bet the bigger o-ring is for bigger bike maybe.

I’ve brought same thing

Does this work?