Air/Fuel Screw Extensions
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!
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.
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.
"T" handle extension $16.00 (pictured below FSE-1) 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.
**Note: Will "not" work on some of the later Model FCR carbs with
the tamper proof flat side rather than the screw driver slot adjustment.
addition to the fuel screw extension, we also have available a complete
extended "replacement" "T" Handle fuel screw for $20.00, (pictured below
FS-1 ) 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 CRF250/450X or the Kawasaki KX250F/450F
models. (These models have a flat side on the shank on the stock fuel screw
and the extension may not fit correctly. We recommend the replacement
extended fuel screw for those.) To remove the flat sided stock fuel
screw an 18 guage (blue) insulated butt connector can be used. Thanks
Brian C. for the tip from the CRF's Only Forum.
Form for all FCR applications.)
PN. FS-2. Fits:
Kawasaki 84-up KLR250/600/650, 95-up KLX250/300, & 06-up KLX250 Dual
PN. FS-3. Fits:
Honda 2003-up Honda CRF100/150F/230F & 96-up XR100/200/250/400/600/650R.
(Will not fit the CRF230L duel sport model)
***Here is a Video for
installing the FS-3 extended fuelscrew on the CRF230F. https://www.youtube.com/watch?v=Roz-qMfKY3M
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)
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.
for the above Kientech extended fuelscrews is $16. (See 0rder
Form for complete listings)
PN: KFS-1 Also fits: Yamaha TTR225
and the Suzuki DR125/200 with the CV
* 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
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