Yamaha Jet, Main (#90) – 830-14231-18-00

Precision-Calibrated Main Jet for Yamaha Carburetors

The Yamaha - Jet, main (#90) - 830-14231-18-00 is a genuine Yamaha OEM main jet designed to deliver precise fuel flow in carbureted Yamaha engines. Built to exact factory specifications, this part ensures optimal combustion, smooth throttle response, and consistent engine performance—whether at idle or full throttle.

As a direct replacement for worn or clogged jets, this component plays a vital role in maintaining fuel efficiency and engine longevity.

Key Features

OEM-Calibrated Fuel Flow: Precisely metered jet size (#90) for accurate air-fuel mixture delivery.

Factory Fit & Finish: Direct replacement with no modification required—fits like the original.

Corrosion-Resistant Brass: Durable construction resists fuel degradation and corrosion over time.

Compatibility

Part Number: 830-14231-18-00

Jet Size: #90 Main Jet

Compatible with select Yamaha outboard motors and personal watercraft models equipped with carburetors.

For exact fitment, consult your engine’s service manual or parts diagram.

Ideal Use Cases

Fuel System Tune-Up: Replace old or restricted jets to restore performance and efficiency.

Altitude or Temp Adjustments: Fine-tune your engine’s fuel delivery to match operating conditions.

Engine Rebuild Projects: Ensure your carburetor is rebuilt with OEM-calibrated components.

Why Accurate Jetting Matters

Using the correct main jet size is crucial to maintaining optimal combustion. An undersized or clogged jet can cause lean conditions and engine damage, while oversized jets may flood the system and waste fuel. The Yamaha - Jet, main (#90) - 830-14231-18-00 helps maintain the perfect balance for peak performance and engine health.

Frequently Asked Questions

How do I confirm this is the correct main jet for my Yamaha engine?

Refer to your engine’s service manual or consult a Yamaha-certified technician to verify compatibility with jet size #90 (part number 830-14231-18-00).

Can I install this jet myself?

Yes, if you're experienced with carburetor maintenance. Otherwise, professional installation is recommended to ensure precise tuning.

Is this jet compatible with aftermarket carburetors?

This jet is designed for Yamaha OEM carburetors. Compatibility with aftermarket parts may vary and should be confirmed with the manufacturer.