What all does the mixture screw do? Is this basically just an idle/low RPM circuit? I installed my jet kit and never touched the mixture screws from their stock setting. It idles fine and runs excellent, should I even mess with adjusting the mixture screws?

 

Don't mess with the screws unless you have a "backfire" or "popping" through the exhaust upon deceleration with no throttle applied.

 

I do have a backfire every once in a while. And it is when I decelerate.

 

You should be able to turn the mixture screws out (counterclockwise) about a half turn to cure the lean condition. Get a small, flat, screwdriver or a flexible screwdriver to adjust without disassembling everything. Make sure and "feel" the screwdriver "drop" into the adjustment slot for proper adjustment. It may be easier to just disassemble everything to do the job perfect (depending on preference) if time allows.

Oh yea.....the mixture screw(s) adjust the idle circuit only. THis is the circuit you are on when decelerating with no throttle applied.

 

What kind of lowering kit do you have installed? Can you still leave the lights installed? How do you like the flipped linkage?

 

generally speaking you dont have to adjust your mix screws, dynojet calls for 3 turns out and that works for most applications, backfire after you let up on the throttle is a sign of "lean" condition that probably has little to do with your mixture screws, you may have to go up on your pilot jets (either 25 or 27.5), and make sure you dont have an air leak in your carb boots

 

Thanks. I do have 25 pilots that I can throw in as a last resort. I will try and adjust the screws first.

As for the lowering kit and linkage. I have the durablue front kit, and yes you have to remove the lights. It handles great now, I am however having problems bottoming out the suspension on big jumps. So I guess new shocks will be on my list of things to buy, its only money right.

 

Considering that the mixture settings are different for each carb, 3 turns out on each carb "may or may not" help the situation. 1/2 turn out from original position should definately help the lean condition.

The mixture screws and pilot jets work in conjunction for proper air/fuel ratios on the idle circuit. A larger pilot jet is recommended when the mixture screws are turned out past 3.5-4 turns (everyone has an opinion on how many turns out requires a change).

 

true the mixture and pilot jets work together, but the mixture screws are primarily for the idle circuit and the pilots are responsible for idle-->1/4 throttle, needle jets affect 1/4-->3/4, mains 3/4-->full, to properly jet you should chop the throttle after riding at whichever condition you want to check kill the engine and pull the plug and check for lean/rich condition. whatever works for you though

 

The mixture screws actually increase or decrease (depending on turning screws out or in) available fuel coming from the pilot jets. Same circuit. Idle circuit.