Vertex Complete Engine Rebuild Kit – KTM 50 SX / 50 SX Pro Junior / Pro Senior (2004–2008) (WR00003 / 0903-1630)

Description

The Vertex WR00003 Complete Engine Rebuild Kit (0903-1630) is a full OEM-grade rebuild solution for KTM 50cc 2-stroke engines. Designed for 2004–2008 KTM 50 SX, Pro Junior, and Pro Senior models, this all-inclusive package brings factory performance and reliability back to your mini racer.

Each component is engineered to precise tolerances, combining Vertex forged pistons, Hot Rods crankshaft assemblies, and full gasket and bearing coverage for a smooth, durable rebuild that’s ready for track or trail.

What’s Included

✅ Hot Rods crankshaft (stock stroke)
✅ Vertex piston kit – piston, rings, wrist pin & clips
✅ Complete engine gasket & O-ring kit (top + bottom end)
✅ Main bearing & seal kit
✅ Transmission bearing kit
✅ Counter-balancer bearing kit
✅ Water-pump bearing & seal kit
✅ Countershaft bushing & seal kit
✅ Wrist-pin bearing

Fitment

📦 Fits the following models:

• 2006–2008 KTM 50 SX

• 2004–2005 KTM 50 SX Pro Junior

• 2004–2005 KTM 50 SX Pro Senior

(Fits 50cc 2-stroke KTM mini motocross engines)

Key Features

• One-box rebuild solution with OEM-quality parts

• Vertex piston and Hot Rods crank ensure factory-spec reliability

• Includes all critical bearings, gaskets, and seals

• Perfect for full motor overhauls or race-ready maintenance

• Engineered for performance and longevity in youth competition engines

Warranty Info

Manufactured by Vertex / Wrench Rabbit.
For warranty or technical support, contact Vertex or Wrench Rabbit directly.

Price & SKU

💲 Retail Price: $548.95
SKU: WR00003 / 0903-1630
Estimated Shipping Weight: 5.7 lb
Handling: Ships next business day