Exhaust expansion chamber KTM85 03-17 47005007100

For the KTM 85 SX (2003–2017), the expansion chamber is the heart of the bike's power delivery. This specific part (47005007100) is a staple for young racers looking to restore that crisp, high-RPM 2-stroke hit.

Here is a high-performance Shopify description designed to drive sales and reduce fitment questions.

KTM 85 SX Exhaust Expansion Chamber (2003–2017)

Part Number: 47005007100

Product Overview

Bring back the factory-level performance of your mini-racer. This Genuine-Spec Exhaust Expansion Chamber is precision-engineered for the KTM 85 SX, covering over a decade of championship-winning models.

Whether you’re replacing a pipe flattened by a crash or a rusted-out stock unit, this chamber is tuned to provide the exact backpressure needed for the 85cc power valve system. It delivers a smooth, predictable low-end that transitions into a screaming top-end—essential for clearing doubles and grabbing hole shots.

Key Features

• Tuned Powerband: Designed specifically for the KTM 85cc engine dynamics to ensure no "flat spots" in acceleration.

• Heavy-Duty Steel: Constructed from high-quality plate steel with reinforced welds at the mounting brackets to handle the rigors of motocross.

• Factory Finish: Features a clean, professional finish that resists high-temp discoloration better than thin aftermarket alternatives.

• Perfect Fitment: A true "bolt-on" part that aligns perfectly with OEM silencers and frame mounting points.

Technical Specifications

Fitment Guide

This expansion chamber is a direct fit for the following models:

• KTM 85 SX: 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017.

• Husqvarna TC 85: 2014, 2015, 2016, 2017.

Pro-Level Maintenance Tip

Stop the Leak: A dented or leaking pipe isn't just loud—it costs you horsepower. When installing your new 47005007100 pipe, we strongly recommend replacing your exhaust manifold O-rings and tension springs to prevent "spooge" leakage and ensure maximum compression.

Recommended Add-Ons

• Exhaust O-Ring Kit: Keep your cylinder interface air-tight.

• KTM Swivel Springs (55mm/67mm): Prevent vibration-induced cracking.

• KTM 85 SX Silencer Packing: Refresh your muffler at the same time for total exhaust restoration.