HZ Muffler Assembly Exhaust Kit for Honda GX340 GX390 GX420 & Predator 420cc Engines | 11-16 HP

Overview

Introducing the HZ Muffler Assembly Exhaust Kit, a durable and practical solution designed for Honda GX340, GX390, and GX420 engines, as well as Harbor Freight Predator 420cc units. Built for engines in the 11–16 HP range, this kit provides a reliable pathway to quieter operation, easier maintenance, and quicker service intervals. It combines a robust muffler with thoughtful hardware to help your machines perform with steadiness under typical tasks like pumping, washing, and cutting chores around the job site or yard.

What’s inside

The kit is engineered as a complete replacement, including everything you need to restore or upgrade exhaust performance. Contents overview:

• muffler assembly, exhaust pipe, manifold, muffler cover
• 5 muffler nuts, 2 muffler studs, 2 gaskets
• 1 spark plug for routine maintenance

Compatibility and use cases

This muffler kit serves as a versatile replacement, suitable for Honda GX340, GX390, and GX420 engines, as well as popular 420cc clones like the Predator from Harbor Freight. It also accommodates a variety of engines in the 389cc–440cc class, making it a practical option for fleets with mixed equipment. Potential applications include water pumps, pressure washers, air compressors, log splitters, and chipper shredders, among other power tools that rely on these engines. Brands such as Dewalt, Simpson, Northstar, BE Power, and Mi-T-M frequently pair with these engines, underscoring the kit’s broad compatibility.

• Engines: Honda GX340, GX390, GX420; Predator 420cc; other 389–440cc units
• Applications: water pumps, pressure washers, air compressors, log splitters, chipper shredders, and related equipment
• Replacement scope: covers common exhaust muffler and shield parts across multiple brands

Quality, fit, and maintenance

As a cost-conscious rebuild option, this kit bundles essential hardware with a spark plug for on-site servicing. Designed to withstand heat and vibration, the kit aims to deliver dependable performance while simplifying replacement tasks when needed. Keep in mind that results can vary with engine type and operating conditions, and the kit is intended to support maintenance and replacement rather than guarantee a specific outcome.