Air/Fuel Screw Extensions and Replacements

If you have ever tried to adjust the air/fuel mixture adjusting screw on a newer Honda, Kawasaki, KTM, Suzuki, or Yamaha while the engine is running, one of these is a must!

To adjust these mixture screws, the engine needs to be warmed up and running at a low idle. Then simply turn the "T" handle slowly in (clockwise) until the idle slows, then turn it out (counterclockwise) until the idle slows again, noting how many turns you made in between. Then turn it half way between the low idle points. That is normally as good as it gets.

You can also determine if the pilot jet is of the proper size. If the low idle point never comes when turning the fuel/air adjuster out, then a larger pilot may be required, and if low idle never comes after turning it in, then a smaller pilot jet may be required. 

The "T" handle extension $16.00 ( pictured below "left" ) presses onto the existing mixture screw and eliminates the need to carry a special tool so one can dial in the mixture to minimize that stall/cough right off idle. They really come in handy for adjusting for elevation changes of more than 500 feet. 

In addition to the fuel screw extension, we also have available a complete extended "replacement" "T" Handle fuel screw for $20.00, ( pictured below also ) then if something goes wrong or if you sell your bike, you still have your OEM fuel screw as a spare. This complete replacement fuel screw may not fit the aftermarket FCR carbs such as the ones from Carb Parts or Sudco, but the fuel screw extension only should work fine except on the 07 or newer Honda CRF450X or the Kawasaki KX250F/450F models. (These models do not have the shank on the stock fuel screw for the extension to fit over.)

                                          (See Order Form for all FCR applications.)

                      PN: FSE-1                                           PN:  FS-1

 
                                     Fuelscrews Below Fit:

PN. FS-2.  Fits: Kawasaki 84-up KLR250/600/650, 95-up KLX250/300, & 06-up KLX250 Dual Sport. 
PN. FS-3.  Fits:  Honda 2003-up Honda CRF80/100/150F/230F & 96-up XR100/200/250/400/600/650.                                                        

                      PN:  FS-2                                            PN:  FS-3

We also have available from Kientech Engineering extended fuelscrews for the Suzuki DRZ400 "S", and the 1990-99 DR250/350/SE/1996-up DR650 models. (Pictured below) 

                  PN:  KFS-2                                          PN:  KFS-1

Price for the above Kientech extended fuelscrews is $16. (See 0rder Form for complete listings)

Presently we do not have a distributor for our fuel screw products, and  require a $25.00 min order (including both the replacement fuel screws and extensions) to cover the packaging and shipping costs, so if you have a friend that can use one also, there would not be a $25.00 min. charge when ordering two or more of any type fuel screw or extension. 

* Note:  All the above fuel screws have a maximum usable range of approx. 2.5 
turns out from seated, any farther will take the tension off of the friction spring 
and allow the fuel screw to vibrate out. :-(  If your bike runs the best at near 3+ 
turns out, a larger pilot is most likely required.  Also if you do loose one while riding, plug the hole so as dirt cannot enter in and you should be able to continue riding and just have an erratic idle.
 
 

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