Right-Hand / Oil-Filter-Side Exhaust • High-Mount Design • Fully Aluminized Steel • Fits Select Honda V-Twin Engines

Replace a worn or damaged exhaust system with the MUF-0423 high-mount muffler, designed for select Honda GX610, GX620, and GX670 V-Twin engines. This is the right-hand / oil-filter-side configuration, making it an ideal replacement when your equipment requires the exhaust to discharge on the filter side of the engine.

The compact high-mount design keeps the exhaust assembly above the engine mounting plane, while fully aluminized T125 steel construction provides excellent resistance to heat and corrosion. The muffler is designed to meet Honda specifications and provides a durable replacement solution for commercial and industrial equipment powered by these older Honda V-Twin engines.

Key Features & Benefits

• Fits Honda GX610, GX620 & GX670 Engines
  Designed specifically for select older-style Honda V-Twin engine applications.
• Right-Hand Exhaust Configuration
  Exhaust exits on the oil-filter side of the engine.
• High-Mount Design
  Positions the muffler above the engine mounting plane for compatible equipment installations.
• Fully Aluminized T125 Steel
  Provides excellent corrosion resistance for demanding high-temperature exhaust applications.
• Compact Exhaust Assembly
  Designed with a low component count and compact layout for easier integration into compatible equipment.
• Designed to Honda Specifications
  Engineered for proper fit and exhaust performance on the intended Honda GX V-Twin engine family.
• Replacement for Older Honda V-Twin Applications
  Especially useful for equipment still powered by the GX610, GX620, and GX670 engine series.

Engine Compatibility

The MUF-0423 is designed for select:

• Honda GX610
• Honda GX620
• Honda GX670

These are older-generation Honda V-Twin engines. This muffler should not be assumed to fit newer GX630, GX660, or GX690 engines, which use different exhaust configurations.

Right-Hand / Oil-Filter-Side Configuration

The MUF-0423 is the right-hand discharge version for GX610, GX620, and GX670 engines.

For proper orientation, this configuration places the exhaust on the oil-filter side of the engine. A corresponding left-hand / starter-side configuration is a different muffler and should not be substituted without confirming fitment.

Because equipment manufacturers can install the same engine in different orientations, always compare your existing exhaust layout before ordering.

High-Mount Design

The MUF-0423 uses a high-mount layout that positions the muffler above the engine mounting base.

Published dimensional guidance indicates:

• Approximately 8.5 inches from the exhaust flanges to the rear of the muffler
• Approximately 5.5 inches of additional height above the engine when installed

These measurements can be especially important on equipment with hoods, guards, tanks, storage compartments, or other components located close to the engine.

Ideal Applications

The MUF-0423 may be suitable for compatible Honda-powered equipment such as:

• Log splitters
• Generators
• Pressure washers
• Air compressors
• Pumps
• Agricultural equipment
• Construction equipment
• Industrial power units
• Specialty machinery
• Other equipment using compatible GX610, GX620, or GX670 engines

Exact fit depends on the engine and equipment configuration.

Quick Specifications

The eBay listing identifies this as the MUF-0423 Old Style V-Twin Engine Muffler, Filter Side / Right Hand, while published product information confirms fitment for the Honda GX610, GX620, and GX670 engines.

Package Contents

• One MUF-0423 high-mount muffler assembly

Exhaust gaskets are not included. Existing mounting brackets and hardware may also need to be reused depending on the application.

Important Fitment Information

The MUF-0423 is not a universal muffler. Before ordering, verify:

• Engine model is GX610, GX620, or GX670
• Exhaust is required on the oil-filter side
• Existing muffler uses a high-mount configuration
• Exhaust-flange locations match
• Equipment has adequate clearance above and behind the engine
• Existing brackets and mounting hardware are compatible

Do not order based solely on engine horsepower or the appearance of the muffler.

Newer Honda V-Twin Engines

The MUF-0423 is intended for the older GX610 / GX620 / GX670 engine family. Honda GX630 / GX660 / GX690 engines use different muffler systems, so this part is not advertised as interchangeable with those newer engines.