Vertex Top End Gasket Set - Husqvarna FC 450 14-15, KTM SX-F 450 13-15, XC-F 450 13-15 (W6913) (W6903)

The Vertex Top End Gasket Set (W6913 / W6903) is a model-specific replacement gasket kit engineered for the top end rebuild of the KTM 450 SX-F and 450 XC-F (2013–2015) and the Husqvarna FC 450 (2014–2015). It is suited to riders and mechanics carrying out scheduled maintenance or repair work on these four-stroke motocross and cross-country competition engines.

Vertex is an Italian manufacturer with a long history supplying OEM and aftermarket engine components for off-road and motocross applications. Each gasket in this set is produced to precise tolerances to ensure correct sealing across cylinder head and barrel mating surfaces.

• Model-specific fitment for KTM 450 SX-F 2013–2015 and 450 XC-F 2013–2015
• Model-specific fitment for Husqvarna FC 450 2014–2015
• Complete top end gasket set covering cylinder head and barrel mating surfaces
• Manufactured by Vertex, a specialist Italian engine components brand
• Part numbers W6913 and W6903 for cross-reference compatibility verification

Before installation, thoroughly clean all mating surfaces to remove old gasket material, carbon deposits and oil residue — any contamination will compromise the seal.
Inspect the cylinder head and barrel mating surfaces for warping or scoring with a straight edge before fitting new gaskets; do not install on a damaged surface.
Do not reuse old gaskets; replace the entire set during each top end rebuild to ensure consistent sealing.
Apply torque to cylinder head bolts in the manufacturer-specified sequence and to the correct torque values listed in the KTM or Husqvarna service manual for your model year — never estimate torque by feel.
Allow sealant (if specified by the service manual for any non-paper joints) to cure for the manufacturer's stated period before starting the engine.
After reassembly, perform a leak-down or compression test to verify correct sealing before returning the bike to service.
Bed-in the engine gently for the first few minutes of running after a top end rebuild — avoid high loads or maximum revs immediately.
Store unused gaskets in their original packaging in a cool, dry location away from direct sunlight, fuels and solvents, which can degrade gasket materials.