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
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 20, 2013
Works great
Easy to install
November 19, 2015
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 18, 2014
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 13, 2013
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Product Style Item # Manufacturer Product # Availability
Black 1127384 639201 In Stock: Ships next business day