he Yamaha 1.8L Intake Manifold to 1.9L Cylinder Head Adapter Flange is the ideal solution for seamlessly pairing a 1.9L cylinder head with a 1.8L intake manifold. Whether upgrading your 1.8L engine with the reinforced Yamaha cylinder head from the 2024+ Yamaha 1.9L engines or using a 1.8L intake manifold on the new 1.9L Waverunner, this adapter flange ensures perfect alignment and effortless compatibility.
Key Features:
Precise Fit: The adapter flange perfectly matches the 1.8L’s round intake runners with the oval intake ports on the 1.9L’s cylinder head, ensuring a seamless fit.
Easy Installation: The 2-piece design aligns with all concentric studs, making installation straightforward. An O-ring seal groove between the two flanges maintains a perfect seal.
Optimized Airflow: The adapter flange is shaped to allow a smooth transition from round to oval, enabling the high-flow air-fuel mixture to pass without obstruction.
Compact Design: With a total thickness of just 0.656", the low-profile 2-piece design allows for minimal intake manifold relocation, maintaining the original engine layout.