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KLX250S: Fuel and Intake

KLX250S

Drivetrain Note: 

* KLX250S The stock chain length for the stock 14-42 gearing on the ´06 & ´07 models, or the 13-42 gearing on the ´09 to Current models is 106 links.

If you have the KLX250SF SuperMoto version with 13-39 gearing, that will still take the 106 link chain. If you run 45 or larger on the rear, you might want to opt for the 108 link chain.

Front Tire:            Rear Tire:              Spark Plug:
80/100-21 (S) 100/100-18 (S) CR8E
110/70-17 (SF) 130/70-17 (SF) CR8E

 

Fuel and Intake

KLX250S '08 - '18

The EJK evolved out of the need to address the ever-increasing complexity of factory fuel injection. For the newcomer to the market or professionals wanting an easier method for tuning fuel injection, the EJK is a customizable solution for the rider that wants to take control of their tuning needs.

This unit is a piggy-back EFI controller because it does not replace the stock ECU, but rather monitors the signals to the injectors and makes fuel adjustments based on the mode settings. The GEN 3 has a push button interface allowing access up to 6 different modes to allow for quick fine tuning by the end user without needing a computer.

Key Features:

  • No computer or dyno needed!
  • Plug and play, simple to install, base settings preset
  • Unique load based technology
  • Full range tunability available
  • Does NOT interfere with stock ECU operation
  • Simple push button adjustment interface
  • Water-resistant 
  • 2-Year warranty
  • Compact size - 2.2" H x 3.4" W x 0.5" D
Please contact us for availability information
$249.95
KLX250S '09 - '14
  • Provides a simple and affordable solution to carburetor tuning problems
  • Allows you to tune your bike for increased power and smoothness while retaining fuel economy
  • Includes a guide booklet on how to install and use your jet kit to it's full potential
Add Pocket Tuner Tool
Ships same business day
$102.95
Universal fit. May require additional adjustment or modification.

Genuine Keihin spring, washer, and oring for the fuel screw of FCR and FCR MX carbs.

Just the parts…
Fuel screw spring, washer, o-ring (fuel screw not included)

Ships in 1-2 weeks
$8.95
Universal fit. May require additional adjustment or modification.

The small size and right angle hose barbs make this filter easier to fit into the small space between your fuel petcock and carburetor. Filter body is only 7/8" diameter. Straight filter is 2" long, 90 degree filter is only 1-5/8" long.

Choose Type
Ships same business day
$24.95
Universal fit. May require additional adjustment or modification.

This filter is meant for 5/16" fuel lines. Only 1/2" thick it is small enough to fit just about anywhere.

Choose Pack
Ships same business day
$24.95
KLX250S '94 - '07
  • Increased air flow over the stock air filter
  • Designed to increase horsepower and throttle response
  • Designed to fit inside the factory air box
  • Larger surface area over foam filters which offers longer service intervals in dusty conditions
  • Four layers of premium cotton gauze provides outstanding filtration
  • Washable & re-usable, never wears out
  • One filter will last the lifetime of your bike
Add Air Filter Care Kit
Ships in 3-5 business days
$76.95
KLX250S '94 - '25
  • Designed to fit in the factory air box exactly like original filter
  • The best selling replacement air filter for competition motorcycles and ATVs
  • Unique two stage design allows for easy and complete cleaning
  • Dual layer of foam, can be serviced separately
  • Thin Ultra Seal base is virtually impossible to tear and has a built-in "Grease Groove"
Ships in 3-5 business days
$28.95
Universal fit. May require additional adjustment or modification.

Sold in 6 packs

  • Compatible with many air filter boxes. Easy to install by drilling 1’’ holes in airbox housing and snap fitting vents in.
  • May be cleaned and re-oiled
  • More air flow allows you to add more fuel to your intake mixture, increasing performance.
  • 1" Diameter

Not legal for use on pollution controlled vehicles in the state of California.

Ships same business day
$14.95