Fasstek Racing Exhaust Adapter Yamaha YI-3 / YI-4 Motor

The Fasstek Racing exhaust adapter allows a YI-4 exhaust system to be installed on a Yamaha YI-3 engine. The adapter is mounted directly to the cylinder head outlet and connects the engine’s exhaust port to the header of the next-generation engine.

For conversions within the Yamaha Underbone engine platform, the diameter and shape of the exhaust port differ between generations. This adapter compensates for these differences and allows for a clean installation of the header.

Made from precision-machined aluminum, the adapter ensures a stable connection between the cylinder head and the exhaust system and is frequently used in performance or tuning conversions.

Technical Specifications

• Manufacturer: Fasstek Racing
• Product: Exhaust Adapter / Head Exhaust Adapter
• Type: YI-3 to YI-4
• Material: Aluminum
• Application: Exhaust system / Manifold connection

Fits:

• Yamaha YI-3 engine
• Yamaha YI-4 engine

Included

• 1 × Exhaust adapter
• 1 × Spacer ring

Categorized in:

• Parts > Cylinder > Spare parts Cylinder head and Camshaft
• Parts > Rear silencer, spare parts & accessories > Exhaust Spare Parts