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CRF150R: Fuel and Intake

The CRF line was launched in 2000 as a successor to the Honda XR series. The CRF-R is a liquid-cooled four-stroke engine. They are designed to be utilized purely for closed-course motorcross racing. The CRF-R lineup lacks any extra accessories; like lights and electric start (Although offered as an option on the 2017 CRF-450R).

Chain Size:        Front Sprocket:        Rear Sprocket:        Front Tire:        Rear Tire:        Spark Plug:
420x120 15T 50T 70/100-17 90/100-14 CR9EH-9

 

Fuel and Intake

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

Boyesen Quickshot 3 Accelerator Pump Cover

CRF150R '07 - '18 CRF250R '04 - '19 CRF450R '02 - '19 DR650 '96 - '19
$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.

FCR-MX Accelerator Pump Spring

DR650 '96 - '19 CRF150R '07 - '18 CRF250R '04 - '19 CRF450R '02 - '19 CRF450X '03 - '19 KX250F '04 - '19 KX450F '06 - '19 WR250F '01 - '19 YZ250F '01 - '19 YZ450F '03 - '19
$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.

JD Jetting Fuel Mixture Screw

CRF150R '07 - '18 CRF250R '04 - '19 CRF450R '02 - '19 DR650 '96 - '19
$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.

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

R&D Flex Jet Easy Access Mixture Screw

CRF150R '07 - '18 CRF250R '04 - '19 CRF450R '02 - '19 DR650 '96 - '19
$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.

Filtered Air Vents

$12.95

Sold in 6 packs

  • Compatible with many air filter boxes.
  • More air flow allows you to add more fuel to your intake mixture, increasing performance.
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

Boyesen QuickShot 3 Accelerator Pump Cover

CRF150R '07 - '19
$109.95

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

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

Carburetor Overflow Canister

$39.95

This canister by Pro Circuit allows you to move the overflow tubes from the carburetor up and out of the way. Universal application.

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

K&N Air Filter

CRF150R '07 - '19
$199.95
  • 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
WARNING: This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

Mikuni Pocket Tuner

$6.95

A handy pocket size slide calculator from Mikuni to help you calculate jetting changes due to temperature and elevation changes. Will work for single and multiple cylinder machines whether 2 or 4 stroke. Also includes a guide for determining rich or lean conditions.