I THOUGHT THE RULE OF THUMB OF A PILOT JET WAS IF THE SCREW IS TURNED OUT MORE THAN 2 TURNS YOU NEED A BIGGER PILOT JET. AND IF YOU ARE OUT LESS THAN 1 TURN YOU NEED A SMALLER JET. WHAT'S UP WITH EVERYONE GOING 2.5 TURNS?

 

I have been working on bikes since 1980 I have never heard of that ....... Just whatever senerio works best for your bike and setup...

 

There's gotta be some limit... I mean, is 3 turns out OK? 4 turns? There has to be some point at which you need to change out the pilot.

 

I HAVE HAD 2 KDX220 BEFORE THIS BIKE. MAYBE ITS A 2 STROKE THING, ITS HOW I'VE ALWAYS DON IT AND IT WORKS WELL. I'VE BEEN RIDING SCENE 1977 AND WORKING ON BIKES SCENE 1985

 

The pilot jet & air mixture screw manage fuel delivery at the low end throttle settings - e.g.: Idle to 1/4 throttle. (Note that its the low end throttle settings, not the low end engine speed). Seems then that these 2 would have an affect on decelleration popping, as well as low end performance?

 

I thought rule of thumb was keeping it out of movin parts

 

I set it up as instructed in the begining of the forum, 40 jet 2.5 turns out,,, it runs mint like this why argue??? I was taught by my dad who was an ace Chrysler mechanic to set the Idle screws like this, basic set up is 1.5 turns to start with,, then slowly turn them in until the motor starts to falter abit ,, stop there and back it until the motor rpm smooths out , Done ... Been setting carbs up like that scince i was 12,,, ( 3hp briggs and stratton minibike ) and still to this day on my hot rods and racecars.