Fuel and Intake

WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

Accelerator Pump Cover, Boyesen Quickshot 3

CRF450R '02 - '21
$119.95

This cover acts as an 'adjustable leak jet' to fine tune the accelerator pump squirt.

Eliminates "4-stroke bog" when used with correct jetting. Allows the use of correct carburetor settings to optimize performance, starting and reliability. Improved low-end performance with much better throttle response. Investment cast and finished to precise tolerances with internal high volume vertical check valve. Fits all motorcycles and ATVs using a Keihin FCR carburetor Easy installation instructions (including online video) and template.

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 Not for the stock DR650 carburetor Fits FCR-MX conversions Only.

WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

Accelerator Pump Spring, FCR-MX

CRF450R '02 - '21
$14.95

Direct replacement for the stock spring and exactly like the old Merge Racing spring. Gives a much more consistent accelerator pump squirt. Eliminates the need for the 'O-ring mod', wire or zip-ties on the pump arm. Fits all Keihin FCR-MX carbs except '07-'08 CRF250/450.

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 Not for the stock DR650 carburetor Fits FCR-MX conversion Only

WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

EFI Programmer, EJK

CRF450R '09 - '21
$224.95

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
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

Fuel Mixture Screw, R&D Flex Jet Easy Access

CRF450R '02 - '21
$39.95

R&D introduces "Flex-Jet", a simple, effective flexible shaft design. Quick adjustments are now within easy reach. Besides easy access, another benefit is the Flex-Jet's ability to hold its setting. Loose fuel screws are now a thing of the past. Kit includes: Flex-Jet (Remote Fuel Screw), bracket, screw, spring, washer, O-ring and instructions.

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 Not for the stock DR650 carburetor Fits FCR-MX conversions Only.

WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

Fuel Mixture Screw, JD Jetting

CRF450R '02 - '21
$23.95

Top quality brass screw with molded knob for easy adjustments.

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 Not for the stock DR650 carburetor Fits FCR-MX conversions Only.