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BBR  |  SKU: 411-HXR-5500

Big Bore Kit - 88cc W/Cam / XR/CRF50, 00-Present

$18699 USD $21995
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Item Fitment

Big Bore Kit - 88cc W/Cam / XR/CRF50, 00-Present - confirmed fit on the following bikes.

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

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

Impressive Power. Engineered and developed by BBR. This cylinder retains skid plate mounts and includes: BBR aluminum cylinder, piston kit, exclusive BBR motocross-grind camshaft and gasket kit. Easy bolt-on instructions included. The most reliable kit available. Runs great with stock carb or bolt on BBR's 18mm carb kit.

Also fits 1988-1999 Z50R with short piston.


  • Cylinder retains skid plate mounts
  • BBR aluminum cylinder
  • 52mm piston specially designed to work with your stock cylinder head's combustion chamber
  • MX-grind camshaft
  • Gasket kit
  • Easy bolt-on instructions included

Installation Note: This kit will not work with the Honda XR/CRF70 or other big port cylinder heads. It is designed for the tiny combustion chamber of the OEM Honda XR/CRF50 cylinder head. The flat top piston dome will result in an extremely low compression ratio when combined with the XR/CRF70 type cylinder head. The result is a motor that makes less horsepower than stock. This is the correct BBR bore kit for the XR/CRF70.


BBR General Jetting Guidelines Chart


Replacement Items

BBR Motorsports

Bore Kit - 88cc W/Cam / XR/CRF50, 00-Present - 411-HXR-5500
BBR

Big Bore Kit - 88cc W/Cam / XR/CRF50, 00-Present

$18699 USD $21995

Impressive Power. Engineered and developed by BBR. This cylinder retains skid plate mounts and includes: BBR aluminum cylinder, piston kit, exclusive BBR motocross-grind camshaft and gasket kit. Easy bolt-on instructions included. The most reliable kit available. Runs great with stock carb or bolt on BBR's 18mm carb kit.

Also fits 1988-1999 Z50R with short piston.


  • Cylinder retains skid plate mounts
  • BBR aluminum cylinder
  • 52mm piston specially designed to work with your stock cylinder head's combustion chamber
  • MX-grind camshaft
  • Gasket kit
  • Easy bolt-on instructions included

Installation Note: This kit will not work with the Honda XR/CRF70 or other big port cylinder heads. It is designed for the tiny combustion chamber of the OEM Honda XR/CRF50 cylinder head. The flat top piston dome will result in an extremely low compression ratio when combined with the XR/CRF70 type cylinder head. The result is a motor that makes less horsepower than stock. This is the correct BBR bore kit for the XR/CRF70.


BBR General Jetting Guidelines Chart


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