KTM 50 SX (2009–2012) Engine Rebuild Kit – Vertex/Wrench Rabbit

KTM 50 SX (2009–2012) Complete Engine Rebuild Kit – Vertex / Wrench Rabbit Description Build the next mini legend with the Vertex / Wrench Rabbit WR101-158 Complete Engine Rebuild Kit — the ultimate 2-stroke overhaul for 2009–2012 KTM 50 SX. This all-in-one youth MX weapon packs a Hot Rods heavy-duty crankshaft, Vertex standard-compression piston, full gasket & seal set, every bearing, and wrist pin — delivering OEM precision, explosive power, and race-ready durability. Rebuild it. Rip it. Win it.

What’s Included

• Hot Rods Heavy-Duty Crankshaft (stock stroke with wrist pin bearing)
• Vertex Piston Kit (standard compression piston, rings, pin, and clips)
• Vertex Complete Engine Gasket Kit (top and bottom end, including seals and O-rings)
• Oil Seal Kit
• Hot Rods Main Bearing and Seal Kit
• Hot Rods Transmission Bearing Kit (includes output shaft collar and sprocket lock washer)
• Hot Rods Counter Balancer Bearing Kit
• Hot Rods Water Pump Bearing and Seal Kit
• Countershaft Bushing/Seal Kit
• Wrist Pin Bearing

Key Features

• Full 2-stroke mini rebuild — top to bottom in one box
• OEM-direct fit for 2009–2012 KTM 50 SX
• Hot Rods + Vertex synergy — forged for high-RPM, hard-hitting power
• Standard compression — perfect for youth motocross domination
• Pro-level components — trusted by junior racers and top teams

Fitment Fits the following models and years:

• 2009–2012 KTM 50 SX

Warranty Info Backed by Wrench Rabbit and Hot Rods limited warranty. Professional installation is recommended to ensure correct clearances and assembly. WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Price & SKU Retail Price: $632.95 SKU: 0903-1259 / WR101-158 Estimated Shipping Weight: 5.7 lbs Handling Time: Ships next business day