Here's why:
* Engine Size and Design: The XT350, XT400E, and XT600E all have different engine sizes and designs. The exhaust system is specifically designed to match the engine's output, volume, and placement of the exhaust port.
* Mounting Points: The exhaust pipe's mounting points on the engine, frame, and swingarm are likely to be different between the models, making direct fitting impossible.
* Exhaust Pipe Diameter: The diameter of the exhaust pipe may vary significantly, impacting the flow of exhaust gases and potentially affecting engine performance.
What You Can Do:
1. Check with Exhaust Manufacturers: Contact reputable motorcycle exhaust manufacturers like FMF, Yoshimura, or Pro Circuit. They may offer exhaust systems specifically designed for the XT400E.
2. Consult Online Forums: Check online forums dedicated to Yamaha XT motorcycles, where experienced owners may have found solutions or shared experiences with aftermarket exhausts.
3. Consider Modification: You could try to modify an XT350 or XT600E exhaust to fit, but this requires extensive fabrication and welding skills. It's best left to professionals with experience in custom exhaust work.
Important Note: Modifying the exhaust system can significantly impact engine performance, emissions, and noise levels. Consult a qualified mechanic before making any changes to ensure safe and legal operation.
