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Innovative 4-Stroke Performance Products

BBR  |  SKU: 420-HXR-5003

CRF/XR50/XR70 18mm Big Carb Kit

$15795 USD
This item will ship Today

Item Fitment

CRF/XR50/XR70 18mm Big Carb Kit - confirmed fit on the following bikes.

  • 2004 - Present Honda CRF50
  • 2000 - Present Honda XR50
  • 1988 - Present Honda Z50R

Shipping & Taxes

We pride ourselves on fast shipping on all orders. Orders placed before 5PM EST will ship the same day Monday - Friday (excluding holidays, and the occasional day off for riding).

US Customers - Taxes (if applicable) will be charged at checkout.

International Customers - Duties/Taxes will be paid at the time of delivery (not checkout).

Description

Perfect add-on for our Big Bore kits and exhaust systems. Increase power throughout the RPM range utilizing 18mm carburetor. Includes all required hardware for easy installation right down to a jet assortment for fine tuning..

These carb kit will also work great on a 1988-1999 Honda Z50R using 7/8" handlebars.

Choose your kit.
420-HXR-5003 includes just the manifold for use with stock XR/CRF50 heads.
420-HXR-5004 includes just the manifold for use with aftermarket big valve heads or the stock XR/CRF70 head.


  • 18mm Carb
  • Special manifold sized for the CRF/XR50 head
  • Special manifold sized for the big valve heads (XR70 and aftermarket)
  • Includes gaskets and bolts
  • Includes throttle and cable
  • Includes 5 main jets and 3 pilot jets

Application Note: This 18mm Carb Kit is not recommended for use on stock displacement CRF50's. Recommended for 82cc or larger displacement motors.

Note: The throttle in this kit is for standard 7/8" diameter handlebars. The stock Honda XR/CRF50 uses 3/4" diameter handlebars. You must use a handlebar kit that changes to 7/8" diameter handlebars to use this throttle. BBR does not make or sell any throttles for 3/4" handlebars

Note #2: This kit does not include an air filter and will not work with the OEM Honda CRF/XR50 air filter. See the UNI filter we recommend (BBR part number 430-HXR-5002) below in the Optional Parts section.

BBR General Jetting Guidelines Chart


BBR Motorsports

Carb Kit - BBR 18mm Stock Heads / XR/CRF50, 00-Present - 420-HXR-5002
BBR

CRF/XR50/XR70 18mm Big Carb Kit

$15795 USD

Perfect add-on for our Big Bore kits and exhaust systems. Increase power throughout the RPM range utilizing 18mm carburetor. Includes all required hardware for easy installation right down to a jet assortment for fine tuning..

These carb kit will also work great on a 1988-1999 Honda Z50R using 7/8" handlebars.

Choose your kit.
420-HXR-5003 includes just the manifold for use with stock XR/CRF50 heads.
420-HXR-5004 includes just the manifold for use with aftermarket big valve heads or the stock XR/CRF70 head.


  • 18mm Carb
  • Special manifold sized for the CRF/XR50 head
  • Special manifold sized for the big valve heads (XR70 and aftermarket)
  • Includes gaskets and bolts
  • Includes throttle and cable
  • Includes 5 main jets and 3 pilot jets

Application Note: This 18mm Carb Kit is not recommended for use on stock displacement CRF50's. Recommended for 82cc or larger displacement motors.

Note: The throttle in this kit is for standard 7/8" diameter handlebars. The stock Honda XR/CRF50 uses 3/4" diameter handlebars. You must use a handlebar kit that changes to 7/8" diameter handlebars to use this throttle. BBR does not make or sell any throttles for 3/4" handlebars

Note #2: This kit does not include an air filter and will not work with the OEM Honda CRF/XR50 air filter. See the UNI filter we recommend (BBR part number 430-HXR-5002) below in the Optional Parts section.

BBR General Jetting Guidelines Chart


Head Type

  • Stock Head (XR/CRF50)
  • Big Valve Head (XR/CRF70)
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