Same-day shipping cutoff: Noon Pacific Time

We will be leaving the office slightly earlier than usual this Friday 5/24 at 2pm (Pacific Time) and will be back in action on Tuesday 5/28 at 9:30am. We are taking a little break to enjoy some quality time with our families and to celebrate the Memorial Day weekend.

Fuel and Intake

Carburetors, Jet Kits, Air Filters, Fuel Filters, EFI Control Modules

Basic Carburetors Tech Talk: https://youtu.be/KGR6-RsXVKg

Model

Accelerator Pump Cover, Boyesen Quickshot 3

CARB   WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
CRF150R '07 - '25

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 carb. Easy installation instructions (including online video) and template.

Ships in 3-5 business days
$119.95

Accelerator Pump Cover, Boyesen Quickshot 3

CARB   WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
CRF150R '07 - '18 CRF250R '04 - '25 CRF450R '02 - '25 DR650 '96 - '25

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.

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

Ships in 3-5 business days
$119.95

Accelerator Pump Spring, FCR-MX

WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
DR650 '96 - '25 CRF150R '07 - '18 CRF250R '04 - '25 CRF450R '02 - '25 CRF450X '03 - '25 KX250F '04 - '25 KX450F '06 - '25 WR250F '01 - '25 YZ250F '01 - '25 YZ450F '03 - '25

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.

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

Ships same business day
$29.95

Carburetor 'Dial it in' Combo, FCR

CARB   WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
CRF150R '07 - '25

Buy both and save! Includes the Boyesen QuickShot 3 and Sunline Mixture Screw

Add Pocket Tuner Tool
Ships in 3-5 business days
$127.95

Fuel Mixture Screw, R&D Flex Jet Easy Access

WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
CRF150R '07 - '18 CRF250R '04 - '25 CRF450R '02 - '25 DR650 '96 - '25

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.

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

Please contact us for availability information
$39.95

Fuel Mixture Screw, JD Jetting

WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.
CRF150R '07 - '18 CRF250R '04 - '25 CRF450R '02 - '25 DR650 '96 - '25

Top quality brass screw with molded knob for easy adjustments.

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

Ships same business day
$23.95