SPI Exhaust Header Manifold Gasket Donut for Yamaha 600/700 – Fits Viper, Vmax, Venom, SX, SRX, Mountain Max – Replaces 8CA‑14714‑00‑00

OVERVIEW

This SPI exhaust header manifold gasket donut delivers a direct OEM replacement seal designed to restore optimal backpressure and eliminate blow-by gases on Yamaha two-stroke snowmobile platforms. Crafted from a high-temperature composite compound, it positions precisely between the exhaust manifold and intake pipe to reestablish factory compression dynamics. Engineered specifically for these Yamaha engines, this durable seal stops leaks at their source while extending service life under extreme thermal loads.

ENGINEERING & PERFORMANCE

The advanced composite formulation withstands severe thermal cycling and mechanical vibration without deforming or losing clamping force. By sealing the gap between the exhaust port and Y-pipe outlet, it restores factory backpressure that directly improves throttle response and mid-range torque delivery. Precision manufacturing ensures exact dimensional tolerances align perfectly with the original cylinder head geometry, preventing assembly misalignment. Riders experience reliable power transfer and reduced cabin fumes without the acoustic penalties associated with degraded factory seals.

KEY FEATURES

• Direct replacement for Yamaha OEM part number 8CA‑14714‑00‑00
• Constructed from high-temperature composite sealing material engineered for exhaust applications
• Made in Taiwan to meet rigorous manufacturing standards
• Precisely machined 61 mm inner diameter matches standard two-stroke Y-pipe outlets
• Mounts securely between the exhaust manifold and main intake pipe
• Eliminates combustion gas blow-by to reduce cabin fumes and exhaust noise
• Resists compression set and hardening after prolonged exposure to extreme heat
• Maintains exact dimensional tolerances for seamless original mounting geometry alignment

TECHNICAL SPECIFICATIONS

• Brand: SPI
• Part Name: Exhaust Header Manifold Gasket Donut
• Exhaust Type: Exhaust System Seal
• Material: High-Temperature Composite
• Supported Years: 1997–2006
• Compatible Trims: SX / SX-R, Vmax Series, SRX, Mountain Max, Phazer (2-Stroke), Venture (2-Stroke)

FITMENT

Fitm:

• Yamaha Phazer (1997–2006)
• Yamaha Mountain Max (1997–2006)
• Yamaha SRX (1997–2006)
• Yamaha SX (1997–2006)
• Yamaha Vmax (1997–2006)
• Yamaha Venture (1997–2006)

WHY RIDERS CHOOSE THIS

Riders select this SPI gasket because its dense composite formula preserves necessary flexibility during freezing winter starts while resisting hardening under prolonged exhaust heat. That combination prevents microscopic gaps from developing, which directly maintains throttle authority and eliminates the power loss typically caused by leaking combustion gases. The precise outer wall alignment mounts flush against the cylinder head without requiring aftermarket adapters or complex modifications. Because it targets the exact weak point in aging Yamaha two-stroke plenums, technicians and recreational riders alike trust it to return the engine to peak factory output season after season.