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Engines and Components› Pistons and Piston Rings

KTM PowerParts

Piston Kit Gr. II (Size B) 300cc

Name: Piston Kit Gr. II (Size B) 300cc
Brand: KTM PowerParts
SKU: 55630307110II

$419.64 $407.05 Save $12.59

SKU: 55630307110II

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Overview

The KTM PowerParts piston kit Gr. II (Size B) is a complete OEM top-end rebuild kit designed to restore performance and reliability in 300cc two-stroke engines. It ensures precise tolerances and optimal heat dissipation for extended engine life.

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The KTM PowerParts Piston Kit Gr. II (Size B) is a comprehensive OEM top-end rebuild solution engineered to restore the performance and reliability of your 300cc two-stroke motorcycle engine. Utilizing genuine KTM parts guarantees precise manufacturing tolerances and superior heat dissipation, contributing to a longer engine lifespan and maintaining the crisp throttle response expected from a high-performance machine. This piston kit is specifically designed for a wide range of 300cc models manufactured between 2017 and 2023. It is compatible with various KTM 300 models such as EXC, EXC TPI, EXC Six Days, XC, XC TPI, XC-W, XC-W TPI, and Erzbergrodeo editions. Furthermore, it fits Husqvarna TE 300, TE 300i, TX 300, TX 300i, Rockstar Edition, Heritage, and Jarvis Edition models. The kit also extends its compatibility to GasGas EC 300 and EX 300 models produced from 2021 to 2023. The Group II (Size B) designation indicates that this piston is typically used for cylinders that have undergone initial wear and require a slightly larger diameter to achieve perfect compression. Replacing your piston at recommended service intervals is crucial for preventing catastrophic engine failure. This kit provides the necessary components to ensure your engine operates at peak efficiency, maintaining its intended power output and responsiveness.

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.

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Specifications

Brand	KTM PowerParts
Part Number	55630307110II
Category	Engines 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.

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