Cardinals Racing Cylinder Head Motor YI-3, YI-4, IN-23 x EX-20

The Cardinals Racing cylinder head is a high-quality performance component for Yamaha YI-3 and YI-4 engines. The enlarged valve diameters—23 mm for the intake and 20 mm for the exhaust—significantly improve airflow, resulting in more efficient cylinder filling and increased engine power.

The precision-machined cylinder head is designed for high loads and is ideal for performance-oriented setups. When combined with racing camshafts, reinforced valve springs, and tuning cylinders, it unleashes its full potential and supports clean and efficient combustion.

The set comes complete with valves and rocker arms, allowing for direct installation of a performance cylinder head.

Technical Specifications

• Manufacturer: Cardinals Racing
• Product: Cylinder head
• Intake valve: 23 mm
• Exhaust valve: 20 mm
• Application: Engine / Cylinder Head / Performance

Fits:

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

Contents

• 1 × Cylinder head
• 4 × Valves
• Rocker arm