YAMAKATO GX340 GX390 Starter Motor w Solenoid - Replacement Starter

In this review the YAMAKATO GX340 GX390 starter motor is evaluated for owners of Honda GX series and common clone engines who need a direct replacement starter with an integrated solenoid. The bottom line: this unit is a straightforward, OEM-standard swap that fits a wide range of GX340/390 applications and related generator engines, and its biggest selling point is compatibility with many part numbers. It is best for users who need an inexpensive, ready-to-install replacement rather than a heavy-duty, high-output starter.

Key Features

• Compatibility: Matches a long list of compatible part numbers so it will bolt in for many Honda GX340 and GX390 engines and popular clone replacements.
• Integrated solenoid: The starter includes the solenoid in the housing for a simple one-piece swap and fewer wiring changes during installation.
• OEM standard fit: Built to the OEM standard form factor used on generators and small engines, which reduces modification time and makes installation predictable.
• Compact power: The unit delivers about 450w of actual motor power suitable for typical electric start usage on small engines and portable generators.
• Boxed with hardware: Ships as a single starter motor with solenoid in a box, ready for installation without extra packaging steps.

Who It's For

This starter motor is aimed at DIY mechanics, landscapers, and generator owners who have Honda GX340, GX390, or common clone engines and need a like-for-like replacement that covers many referenced part numbers such as 128000-2750 and 31210ZB80130. It is also practical for service shops that handle routine maintenance on portable generators and small engine equipment.

It is not ideal for users who need extra cranking power for high-compression, modified, or heavy-duty commercial engines, or for power equipment that requires higher wattage for repeated or demanding starts. The listed 450w motor output means some high-power applications, like power washers, should look for a heavier-duty starter.

Pros & Cons

Pros

• Fits a wide range of part numbers so compatibility is high for GX340/390 and clone engines.
• Sturdy construction and a good physical fit make installation straightforward for most users.
• Integrated solenoid reduces installation complexity compared with separate-solenoid kits.

Cons

• Functionality is mixed in some customer reports, and a few buyers have reported units failing early, so long-term lifespan may vary.

Specifications

Brand	YAMAKATO
Compatible part numbers	SND0288, DB5B6, DB5B8, 41052044, 128000-2750, 31210ZB80130
Engine fit	Honda GX340, GX390 and common clone engines
Motor power	Approximately 450w
Includes	1 x Starter Motor with Solenoid in box
Applications	Generators and small engines (portable generator models and similar)

Our Verdict

The YAMAKATO GX340 GX390 starter motor is a practical, budget-friendly replacement for owners of Honda GX series and clone engines who need an OEM-style fit and the convenience of an integrated solenoid. It represents good value when the goal is a direct swap on generators and small engines, but buyers should be aware of mixed reports on durability and avoid this unit for very high-demand or high-compression starts.

Frequently Asked Questions

Will this starter fit my GX390?
Yes, it is designed to fit GX340 and GX390 engines and many cloned variants that share the same bolt pattern and part numbers.

Can I use this on a power pressure washer?
No, the actual motor power is about 450w, which may be insufficient for some high-power pressure washer engines; a heavier-duty starter is recommended.

Does the package include the solenoid?
Yes, the starter comes with an integrated solenoid installed and ships as a single unit in the box.