Crankshaft Bearings & Seal Kit for KTM SX Pro Jr & Sr 50 2002-2008

Crankshaft Bearings & Seal Kit for KTM SX Pro Jr & Sr 50

This crankshaft bearings and seal kit is a complete bottom-end rebuild set for the KTM SX Pro Jr and Sr 50 from 2002 to 2008, replacing the crank shaft main bearings and crank seals. The kit gives mini-race mechanics the correct-size bearings and seals needed to restore smooth crankshaft rotation and a leak-free crankcase.

Overview

This crankshaft bearings and seal kit is built for the KTM SX Pro Jr and Sr 50 models from 2002 through 2008, supplying fresh main bearings and crank seals for a bottom-end rebuild. The kit suits parents and mechanics maintaining 50cc race bikes who want correct-size components for the crank shaft without ordering bearings and seals separately. Every bearing and seal in this KTM 50 crankshaft kit is sized to the OEM crankcase and crank journal for a drop-in fit.

Built For Performance

• Complete main bearing and crank seal set for the 2002-2008 KTM SX Pro Jr and Sr 50
• Bearings selected to match the OEM crank journal and crankcase bore sizes
• Seals designed to hold crankcase pressure and keep air leaks out of the bottom end
• Restores smooth crankshaft rotation for reliable starting and throttle response
• Direct replacement components with no machining or modification needed
• Ideal for a full bottom-end refresh during rebuild or race prep

Fits These Machines

• for KTM SX Pro Jr 50, 2002-2008
• for KTM SX Pro Sr 50, 2002-2008

On-The-Job Use

• Bottom-end rebuild on 50cc KTM race bikes
• Fixing crank seal air leaks that cause lean running or hard starting
• Replacing worn main bearings during a top-end and bottom-end refresh
• Pre-season race prep for SX Pro Jr and Sr 50 machines

Specs At A Glance

Good To Know

Q: Does this kit cover both the SX Pro Jr and Sr 50 models? A: It is listed for the 2002-2008 KTM SX Pro Jr and Sr 50 machines, which share the same bottom-end layout. Confirm your exact model year and engine before ordering.

Q: Should bearings and seals always be replaced together? A: Replacing crank seals alongside the main bearings is standard practice during any bottom-end teardown. This kit supplies both so the crankcase can be resealed in one pass.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.