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Trackside Air Fuel Mixture Screw

Easily adjust the air/fuel mixture on your Kehin carbs with this convenient Air Fuel Mixture Screw from Trackside.


  • CNC machined from billet aluminum
  • Anodized finish for durability
  • Easy grip and turn design requires no tools for adjustments anytime
  • Numbered 1-4 for easy adjustment
  • Includes spring, two washers and o-ring
  • Designed to resist backing out due to vibrations
  • Fits Kehin FCR carbs
Fitment Notes & Exceptions
This is a universal fit part; it may or may not fit without modification.
3.5 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Fuel screw
I was not able to use the supplied o-ring, the fit was too tight and it would not go in. I installed the fuel screw without the o-ring and it works just fine.

PROS: Easy adjustments

CONS: O-ring To Tight

August 21, 2013
Works great
Easy to install
November 20, 2015
good part to have . fits all brands to
fits all tips of bikes and love how it cums with all the right parts to get it dun in one step
February 14, 2013
This thing is junk bought it and install was a pain do to oring doesnt fit well. Got it installed and then rode 40 min an it fell out set at recomende 2 turns for my jet kit dont buy
April 19, 2014
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Will this fit a 00’ Honda xr100?
A C on Aug 11, 2018
Hello, Will this fit a 2004 Honda VTX 1300s?
A shopper on May 19, 2017
Product Style Item # Manufacturer Product # Availability
Black 1127384 FMS-01 BLACK In Stock: Ships within 24 hours