Engines and Components› Pistons and Piston Rings

NMW Racing

Performance Bore Kit with Piston Kit

$342.23

SKU: KTM DUKE/RC 390 GEN-3 PERFORMANCE BIG BORE KIT BY NMW

In Stock
In Stock
Ships by Sep 12
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Overview

The NMW Racing Performance Bore Kit is designed to elevate the performance of your KTM Duke or RC 390. This kit includes a bored cylinder to expand engine displacement, enhancing power and acceleration, along with a performance piston kit built for durability and high performance.

It is custom-engineered for a seamless integration and optimized fit on KTM Duke and RC 390 models.
Show original supplier description
Elevate the performance of your KTM Duke or RC 390 with the NMW Racing Performance Bore Kit. The kit includes a bored cylinder, a performance piston kit designed for durability and high performance, piston rings, pin, lock, and a copper head gasket with a 0.50 mm thickness. Benefits of installing this bore kit include a substantial boost in horsepower and torque, improving the overall engine performance. The components are custom-engineered for KTM Duke and RC 390 models, ensuring optimized fit and seamless integration. This Performance Bore Kit is suitable for KTM Duke 390 and RC 390 models. The manufacturer notes that Big Bore Kits deliver impressive results when combined with proper tuning, emphasizing the need for optimal fuel flow and overall engine compatibility to unlock the kit's full potential. Variations in setup may influence capacity.

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

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandNMW Racing
Part NumberKTM DUKE/RC 390 GEN-3 PERFORMANCE BIG BORE KIT BY NMW
CategoryEngines and Components

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

Buy with Confidence

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.

View Full Return Policy

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.

View Full Shipping Policy