HZ Electric Starter Motor for Honda GX340 GX390 - Replacement Starter

In this review the HZ electric starter motor is evaluated as a direct replacement for Honda GX340 and GX390 engines and many Honda-clone applications. The bottom line: it is for owners who need a straightforward, bolt-in replacement starter for generators, pressure washers, log splitters and other outdoor power equipment. The single biggest reason to buy is compatibility - this unit replaces a long list of Honda and Predator starter part numbers and fits common 11 to 16 hp and 337cc to 459cc engines, making it a practical spare for mixed fleets.

Key Features

• Wide compatibility: Replaces multiple Honda starter part numbers so it can be used on GX340, GX390 and many clone engines without extensive modification.
• Generator ready: Fits popular portable generator models including 5500 to 9500 watt class units, making service of standby and jobsite machines easier.
• Pressure washer and pump fit: Works with high-pressure washers and WT40 series water pumps that use 337cc-459cc engines, reducing downtime for cleaning and irrigation equipment.
• Harbor Freight and Predator fitment: Listed as a replacement for Predator 420cc and 459cc starters, so users of those engines can swap starters without sourcing OEM Predator parts.
• Easy to install: Customers report the starter is straightforward to fit to existing mounts and wiring, which speeds field repairs.

Who It's For

This starter is best for homeowners, landscapers and light contractors who maintain a variety of gasoline-powered equipment and want a single replacement part that covers Honda GX340, GX390 and many clone engines. It is particularly useful for service techs who work on portable generators, pressure washers, log splitters, chipper shredders and air compressors where a quick starter swap restores function.

It is less appropriate for users who expect OEM-level longevity without attention to battery condition; customer feedback notes at least one instance of poor battery life after installation, so anyone relying on long-term heavy use should ensure battery health and proper charging systems are in place or consider OEM replacements if factory warranty and manufacturer support are required.

Pros & Cons

Pros

• Broad fitment makes it a versatile spare for many 337cc to 459cc engines.
• Reported easy installation saves time during field repairs and maintenance.
• Compatible with many generator and pressure washer models, reducing parts complexity.
• Often more accessible and affordable than certain OEM replacements.

Cons

• Some users reported battery life or related electrical issues after installation, so battery condition should be checked when fitting the unit.
• Not an OEM part, so buyers who need factory warranty support may prefer original manufacturer starters.

Specifications

Compatible engines	Honda GX340, GX390 and clones (337cc-459cc)
Replaces	Multiple Honda and Predator starter part numbers listed for GX340/GX390 and 420cc/459cc
Suitable equipment	Generators, pressure washers, water pumps, log splitters, chipper shredders, compressors
Generator fit	Popular 5500-9500 watt class portable generators and similar models
Engine power range	11 hp to 16 hp applications
Brand	HZ (aftermarket replacement)

Our Verdict

The HZ electric starter motor is a practical, cost-effective replacement for Honda GX340 and GX390 engines and many clone applications, especially when a single part is needed to service multiple machines. It offers good fitment and simple installation, providing strong value for homeowners and service techs, though buyers should confirm battery and charging system condition to avoid electrical complaints.

Frequently Asked Questions

Will this starter fit my GX390 generator?
Yes, it is listed as a replacement for GX390 starters and fits many portable generators that use GX390-class engines.

Is this an OEM Honda part?
No, this is an HZ aftermarket replacement designed to match fitment and function for the listed Honda and Predator part numbers.

Any common installation issues?
Customers report the unit is easy to install, but you should check battery health and wiring for weak battery issues that can affect starting performance.