Intake Manifold Spacer Set for Honda CB650 RC03 1979–1982 | 16211-426-000

Product Overview

Restore a secure and properly sealed connection between the carburetors and engine with this intake manifold spacer and gasket set, designed for compatible 1979–1982 Honda CB650 motorcycles.

This four-piece set replaces original carburetor intake insulators that have become cracked, loose, distorted, corroded, or difficult to seal after years of engine heat, vibration, and fuel-vapor exposure.

A damaged intake connection can allow unmetered air to enter the engine, potentially contributing to unstable idle, difficult starting, hesitation, hanging RPM, uneven cylinder operation, or inconsistent throttle response.

Manufactured from durable metal, these intake joints provide a sturdy replacement when the mounting-hole spacing, overall length, OEM number, intake openings, and carburetor configuration match the original parts.

Product Compatibility

Brand	Model	Model Code	Year Range	Fitment Notes
Honda	CB650	RC03	1979–1982	Primary listed application
Honda	CB650C Custom	RC05	1980–1981	Confirm OEM number and dimensions
Honda	CB650SC Nighthawk	RC08	1982	Verify the complete intake configuration

Honda parts diagrams identify 16211-426-000 as the carburetor insulator on the CB650 cylinder-head assembly. Aftermarket application catalogs commonly list the four-piece replacement set for 1979–1982 CB650 models and selected CB650C applications.

Model designations and intake configurations may vary by sales market. Use the OEM number and original part dimensions as the final fitment references.

OEM Cross-Reference Numbers

Honda

• 16211-426-000
• 16211426000
• 16211 426 000

These formats refer to the same Honda part number. Honda identifies the original component as Insulator, Carburetor.

Your motorcycle uses four intake connections, but each original part may carry the same OEM number.

Specifications

Specification	Details
Product Type	Carburetor Intake Manifold Spacer / Engine Joint
OEM Reference	16211-426-000
Material	Metal
Installation-Hole Spacing	Approximately 31 mm / 1.22 in
Overall Length	Approximately 37 mm / 1.46 in
Engine Type	Four-Cylinder
Application	Carburetor-to-Engine Intake Connection
Fitment Type	Direct Replacement
Vehicle Type	Motorcycle
Condition	New
Package Quantity	4 Intake Manifold Joints with Gasket Set

The 31 mm mounting measurement and 37 mm length correspond with published listings for this metal-style replacement set. Measurement methods may differ, so compare the exact reference points shown in the product images.

Key Features

• CB650-Specific Fitment: Designed for compatible 1979–1982 Honda CB650 motorcycles using OEM 16211-426-000.
• Four-Cylinder Replacement Set: Includes the intake joints required for the motorcycle’s four carburetor connections.
• Durable Metal Construction: Provides a rigid, wear-resistant replacement for damaged or deteriorated original intake components.
• Helps Restore Intake Sealing: Works with the supplied gasket set to reduce unwanted air entering between the carburetors and engine.
• Direct-Replacement Configuration: Installs in the original intake position when the dimensions and mounting layout match.