air screw mixture

[double d 1]

turning the air mixture screw. which way alows more air in?clockwise more or less, counter clockwise more or less. the manual doesnt say, at least that i can understand anyway. thanks

[Groves187]

on my YZ400 turning the screw in on the FCR allows les fuel and more air. I was told if the screw is on the motor side its called a fuel screw, and if its on the intake side its called a air screw. Plz correct me if i was told wrong.

Thanks, Nick

[ALEXANDERJASON]

4 STROKES = FUEL SCREW
2 STROKES = AIR SCREW

ON THE TRX90 IF YOU TURN IT COUNTERCLOCKWISE (OUT) IT RICHENS (MORE FUEL) THE FUEL MIXTURE IN YOUR PILOT CIRCUIT. TURNING IT CLOCKWISE (IN) LEANS OUT (LESS FUEL)THE FUEL MIXTURE IN YOUR PILOT CIRCUIT.

DON'T BE AFRAID TO GO MORE THAN 2 1/2 TURNS OUT. MOST PEOPLE ON HERE WILL TELL YOU THAT ANY MORE THAN THAT, AND YOU MUST REPLACE YOUR PILOT JET WITH A LARGER ONE. THAT'S SIMPLY NOT TRUE. I HAVE MINE AT ABOUT 3 3/4 TURNS OUT. THAT IS WHERE I HAD TO PUT IT TO GET THE RIGHT PILOT CIRCUIT MIXTURE. THERE IS NO DANGER OF THAT SCREW WORKING IT'S WAY LOOSE, AND YOU STILL HAVE AT LEAST ANOTHER FULL TURN IF YOU NEED IT.

[double d 1]

thanks for the info. can you use a regular screwdriver or do you need the special tool that the manual says you need.

[ALEXANDERJASON]

YOU NEED A "D" TOOL. I WISH I COULD FIND ONE LIKE THE DEALER HAD. IT HAD A 2" FLEXIBLE SPRING RIGHT UNDER THE BIT, AND WAS PROBABLY 12-14" LONG. I HAVE SCOURED THE INTERNET, AND NO LUCK. YOU CAN BUY THE TOOL FROM DYNOJET IF YOU CALL THEIR 800 NUMBER. OR YOU CAN ORDER JUST THE SOCKET FROM MOTION PRO THAT I THINK WILL WORK FOR 1/4" DRIVE RATCHETS AND EXTENSIONS.

I AM CONSIDERING MANUFACTURING THAT TOOL AND SELLING IT. YOU JUST CAN'T FIND IT ANYWHERE, AND YOU KNOW THERE ARE PLENTY OF PEOPLE WHO WOULD LIKE ONE.