KTM · PowerParts · Engine
The KTM Factory Spark Plug is a performance-focused replacement plug designed for demanding 2-stroke riding. Built to be extremely robust, it targets consistent ignition and strong running characteristics through a purpose-built electrode design.
This KTM PowerParts spark plug (part number A40039993010) uses an iridium center electrode tip paired with a reinforced ground electrode. A special design supports improved ignition and performance, while a copper gasket is used to help improve heat dissipation. It is listed for the models shown in the vehicle compatibility table.
Performance
An iridium center electrode tip is used to support dependable spark performance. This material choice is paired with a dedicated plug design intended to promote better ignition and overall engine performance in 2-stroke applications.
Construction
A reinforced ground electrode adds strength where it matters most. Combined with the plug’s robust construction, it is designed to handle demanding use while maintaining the intended ignition behavior and performance characteristics.
Comfort
A copper gasket is specified for improved heat dissipation. By helping manage operating heat at the sealing surface, it supports stable running conditions consistent with the plug’s focus on ignition quality and performance.
Design
KTM designed the Factory Spark Plug with a special electrode layout intended to deliver better ignition and performance. The combination of an iridium-tipped center electrode and a reinforced ground electrode targets reliable combustion characteristics while keeping the construction focused on durability for 2-stroke engine use.
Durability
This spark plug is described as extremely robust, supporting use where strength and consistency are priorities. The copper gasket is specified to improve heat dissipation, complementing the plug’s overall design goals of stable ignition behavior and dependable performance over demanding operating conditions.
| Part Number | A40039993010 |
|---|---|
| Product Line | KTM PowerParts |
| Category | Engine > Engine parts, 2-stroke |
| Model — Model Years |
|---|
| 50 SX — 2024–2027 |
| 50 SX Factory Edition — 2024–2026 |
| 65 SX — 2024–2027 |
| 85 SX 19/16 — 2025–2027 |
Vehicle compatibility as captured from KTM for article number A40039993010.
KTM approval notice: Closed Course Competition Use Only, in the EU.
