A replacement oil-filter cover, a piston kit and a crankshaft assembly require different selection checks. Start with the job you need to complete, then identify the components needed for that job.

This guide focuses on finding and ordering the right parts. For teardown and rebuilding decisions, use our KTM engine rebuild kit guide alongside the repair information for your motorcycle.

Key takeaways

• Record the full model: include the suffix, model year, market and relevant special edition.
• Identify modifications: a VIN cannot reveal every engine swap, cylinder change or previous rebuild.
• Separate identification numbers: diagram positions, casting marks and orderable part numbers serve different purposes.
• Verify the replacement: check supersessions, application notes and any required matching components.
• Order the complete job: include the specified seals, hardware, fluids and service materials.

Genuine KTM, OEM and aftermarket: what is the difference?

Genuine KTM parts are replacement parts supplied under the KTM brand. OEM stands for original equipment manufacturer, but sellers use the term in different ways. It may refer to a genuine vehicle-brand part, an original supplier or a claimed replacement standard. Read the actual brand and part number.

These descriptions can overlap. A manufacturer can supply original equipment and also sell aftermarket products. For example, ProX describes sourcing from facilities that include OEM suppliers. That statement does not make every ProX product a genuine KTM-branded spare.

Choose between documented products based on the repair, specification, availability and complete cost. Neither “genuine” nor “performance” removes the need to confirm the correct application.

Identify the motorcycle and the engine actually installed

Write down the full model designation before searching. A 350 SX-F, 350 XC-F and 350 EXC-F should not be treated as one application. Include the model year rather than relying only on the year purchased or first registered.

• Model and edition: include suffixes and versions such as SIX DAYS, FACTORY EDITION, R or SW where applicable.
• Market: use the country or market version identified in the applicable catalog.
• VIN and engine number: record these accurately and use your owner's manual to locate them.
• Installed configuration: note engine swaps, replacement cases, cylinder kits and other relevant changes.

Why “390” does not identify one engine

KTM lists the 2024 390 Duke at 399 cc, while its 2024 390 Adventure SW page specifies 373 cc. This illustrates why the number in the model name is not an exact displacement specification or an interchange guide.

Even when two models have the same measured displacement, their engine generation or individual components can differ. Confirm compatibility at the part level.

What if the engine has been changed?

The VIN identifies the motorcycle's original application. If an engine or major assembly has been replaced, compare the installed engine number, component identification and available build records. Use photos and measurements to resolve uncertain details with the supplier or engine builder before ordering.

How to find KTM engine part numbers in a parts diagram

The official KTM Spare Parts Finder provides VIN and model search options, an engine-number field, and Engine or Frame categories. Confirm the selected motorcycle before working through the relevant assembly.

1. Choose the correct catalog: check model, year and market against your motorcycle.
2. Locate the assembly: identify the component in context, including nearby seals, spacers and fasteners.
3. Match the diagram position to the parts list: copy the complete orderable part number and description.
4. Read the notes: check size options, application restrictions, replacements and assembly contents.
5. Confirm quantity: distinguish the number used in the assembly from the quantity supplied in one package.

A diagram callout such as “12” identifies a position in that illustration; it is not the part number to order. Likewise, a number cast into a cover or housing may identify a casting rather than the finished service part.

Which KTM engine parts does the job require?

Organize the search around the affected assembly. “Engine parts” includes routine service items, external components and precision internals, but those groups require different evidence before replacement.

Do not apply one four-stroke service-parts list to every two-stroke KTM. Filter arrangements, lubrication systems and engine components depend on the actual design.

For more detail on internal parts, read our KTM dirt bike engine components guide. If the repair involves piston selection, use the KTM piston kit comparison to review sizing and kit-content questions.

Superseded numbers and parts shared across KTM models

A supersession means a catalog directs you from an older part number to a replacement number. Confirm the replacement for your application and read any conditions attached to the change.

Ask whether the replacement is supplied individually or as an updated assembly, and whether it requires companion parts. Do not assume that an older component can replace a newer one simply because the newer number supersedes it.

When is cross-model fitment supported?

A current genuine part number listed for both exact applications supports shared fitment, subject to catalog notes. For aftermarket products, use the manufacturer's application list for that product number. A shared model family, bolt pattern or photograph is weaker evidence.

Keep retailer SKUs separate from manufacturer part numbers. A store may use its own stock code or append a model reference; compare the underlying component number and specification.

If the catalog, listing and installed part disagree, resolve the discrepancy before purchase. Possible causes include an incorrect model selection, a supersession, a special-edition difference or a previously modified engine.

Build a complete KTM engine-parts order

Begin with a diagnosis or a scheduled service requirement. Low compression, noise, oil consumption or leakage can have more than one cause. Replacing the most obvious part without inspecting the affected system can leave the underlying problem unresolved.

For routine maintenance or an external repair

List the main component, the specified replacement seals and hardware, and the fluids or service materials needed to finish the job. A cover may be sold without its O-ring; a filter may be sold without drain-plug sealing hardware. Check each package description.

For a top-end or bottom-end repair

Complete the required inspection and measurements before finalizing precision parts. An engine model identifies the application, but it does not tell you the present condition or finished dimensions of a previously repaired cylinder.

Confirm piston and ring compatibility, bearing requirements and any matched components with the engine builder and the applicable specifications. Do not choose an oversize part simply to compensate for suspected wear.

Check the whole order before checkout

• Main parts: manufacturer, complete part number, selected size and required quantity.
• Sealing parts: the specified gaskets, O-rings, oil seals and sealing washers.
• Replacement hardware: circlips, locking devices and fasteners that the procedure requires to be renewed.
• Kit contents: a written list of what is included and what must be ordered separately.
• Service materials: correct fluids, assembly products and any specified sealant or threadlocker.
• Workshop needs: the repair information, measuring equipment, special tools and any machining or specialist labor.

“Complete rebuild kit” is not a standardized contents list. Compare the included parts with the planned work before comparing prices. Keep the final part numbers and measurements with the motorcycle's service records.

Check the listing and inspect parts before installation

A useful listing identifies the brand, manufacturer part number, supported applications, selected variant and package contents. If one of those details is missing, request clarification before treating the product as a match.

For genuine KTM spares, ask for confirmation that the item is supplied as a KTM-branded part. “OEM replacement,” “OEM quality” and an OEM cross-reference number do not mean the same thing.

Authenticity and documentation

Choose a seller that identifies the product clearly, provides an invoice and can answer sourcing or application questions. Packaging appearance and logos alone cannot authenticate a part. Retain labels and purchase records, and raise concerns before fitting a questionable component.

Before ordering, confirm availability and the applicable return and warranty terms, especially for special-order items or parts requiring machining. Do not assume that every seller or product has the same conditions.

When the order arrives

Compare the delivered numbers, selected sizes, quantities and contents with the order. Check for damage and obvious discrepancies before installation. Resolve a mismatch before machining, modifying or fitting the component.

Browse the KTM's Only engine parts catalog for available products. If an application is unclear, contact KTM's Only with your model details and the part number to ask about suitable options.

KTM engine parts FAQs

Are OEM parts and genuine KTM parts the same?

Not every listing uses OEM the same way. Genuine KTM identifies a part supplied under the KTM brand. An aftermarket part can reference an OEM number or come from an original-equipment supplier without being sold as a genuine KTM spare.

How do I find the correct KTM engine part number?

Select the exact motorcycle in KTM's parts catalog, locate the engine assembly and match the diagram position to the complete part number. Read application notes and supersessions, then confirm the installed engine has not been changed.

Can two KTM motorcycles with the same engine size use the same parts?

Some individual parts may be shared, but displacement alone does not establish compatibility. Check the current part number and application notes, or the aftermarket manufacturer's fitment list, for both exact models and years.

Is the VIN enough if my KTM has a replacement engine?

No. The VIN identifies the original motorcycle application. For a swapped or substantially modified engine, also identify the installed engine and affected components using its number, build records and relevant measurements.

What should I do when a KTM part number has been superseded?

Confirm the current replacement for your application and ask about required companion parts. A supersession does not automatically make the old and new parts interchangeable in both directions or across every model.

Does an engine-parts kit include every gasket and seal?

Only if the contents list says so. Compare the kit with the repair procedure and order any additional gaskets, O-rings, washers, hardware or fluids required to complete the work.

Can I install engine parts using only an exploded diagram?

No. The diagram helps identify components. Installation requires the applicable repair procedure, measurements, specifications and tools. Have a qualified engine technician handle work that exceeds your equipment or experience.