Carb Kit - BBR 18mm Stock Heads / XR/CRF50, 00-Present - 420-HXR-5002
Carb Kit - BBR 18mm Big Valve Heads / XR/CRF50/70, 00-Present - 420-HXR-5002

CRF/XR50/XR70 18mm Big Carb Kit



SKU: 420-HXR-5003
Head Type Stock Head (XR/CRF50)

Only 0 left in stock

CRF/XR50/XR70 18mm Big Carb Kit

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

Item Fitment - Please note this item fits the following bikes
Honda CRF50 (2004-Present)
Honda XR50 (2000-2003)
Honda Z50R (1988-1999)