Keyster Carburettor Fuel Adjustment Kit – Honda NS400R (NC19)

Restore, tune, and optimise your Honda NS400R carburettors with the Keyster Carburettor Fuel Adjustment Kit. Manufactured in Japan, Keyster kits are renowned for their quality and are trusted by restorers, tuners, and professional workshops worldwide.

Designed for one carburettor (one cylinder), this comprehensive kit contains the essential components required for carburettor rebuilding, fault diagnosis, and fine fuel mixture adjustment.

Whether you're restoring a standard NS400R or tuning your engine after intake or exhaust modifications, the Keyster Fuel Adjustment Kit provides the flexibility to achieve precise carburetion.

Features

• Genuine Keyster carburettor tuning kit
• Designed for one carburettor (one cylinder)
• Ideal for carburettor rebuilding and restoration
• Wide selection of jets and needles for accurate tuning
• Premium quality Japanese components
• Suitable for standard engines and performance applications

Kit Contents

Contents may vary slightly depending on the application. Please refer to the product images.

Typical kit includes:

• Needle Valve
• Idle (Air) Screw
• Float Bowl Gasket
• 3 × Pilot Jets
• 6 × Main Jets
• 4 × Jet Needles
• Additional seals, washers and small components as required

Precision Fuel Tuning

Unlike conventional rebuild kits, the Keyster Fuel Adjustment Kit includes multiple jet and needle combinations that allow precise adjustment throughout the throttle range.

This makes the kit ideal for:

• Carburettor restoration
• Solving fuel delivery and running issues
• Fine-tuning after engine rebuilds
• Air filter upgrades
• Performance exhaust installations
• Custom engine modifications

The carefully selected jet sizes are designed to provide smooth and progressive air/fuel ratio adjustments across low, mid and high RPM ranges.

Premium AA Needle Valve

The supplied rubber-tipped needle valve features Keyster's renowned AA Needle design, developed for outstanding sealing performance and durability.

Fitment

Honda NS400R (NC19)

Important: This kit services one carburettor only. The Honda NS400R uses three carburettors, so three kits are required to completely rebuild all carburettors.

Important Information

• Components may vary depending on the specific application. Please refer to the product images before ordering.
• Product specifications may change without prior notice from the manufacturer.
• Any instructions included with the kit are likely to be in Japanese.

Bring your Honda NS400R back to its best with a genuine Keyster Carburettor Fuel Adjustment Kit—the preferred choice for enthusiasts seeking reliable performance and precise carburettor tuning.