Engines and Components› Pistons and Piston Rings

BBR Motorsports

BBR 63mm Piston Kit

$209.95

SKU: 411-KLX-1801

In Stock
In Stock
Ships by Sep 9
Free Shipping over $200
$100 Minimum Order
30 Days Return
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Overview

This kit features a 63mm piston and a 10.5:1 compression ratio, compatible with premium pump gas. The complete kit includes a brand new BBR aluminum cylinder, piston, ring set, pin, clips, and gaskets.
Show original supplier description
This kit replaces the stock 58.0mm bore with a larger 63mm piston, increasing the displacement to approximately 170cc. The 10.5:1 compression ratio is optimized for use with premium pump gasoline, offering a balance of performance and practicality. This comprehensive kit includes all necessary components for installation: a brand-new BBR aluminum cylinder, a 63mm piston, a complete ring set, piston pin, clips, and all required gaskets. The product's quality is highlighted by a testimonial from Duane Brown, who stated, "This is flat out the single best mod you can do to your KLX140 motor" after extensive testing on a BBR KLX140 Concept Bike. For optimal performance and to ensure proper fuel delivery, BBR provides general jetting guidelines. Additional optional parts, such as a high-performance camshaft, are also available separately to further enhance your motorcycle's capabilities.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandBBR Motorsports
Part Number411-KLX-1801
CategoryEngines and Components

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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