YAMAKATO Starter Motor for Honda GX340 GX390 – Replacement with Solenoid, 450W Output

The YAMAKATO GX340/GX390 starter motor with solenoid is a direct-fit electric starter designed to replace worn factory starters on Honda GX series and compatible clone engines.

If your generator, engine-powered pressure washer, or utility machine won’t crank reliably, this YAMAKATO starter motor offers a straightforward swap that restores electric starting. Built to match common mounting and electrical connections for GX340 and GX390-style engines, it’s intended for a wide range of Honda models and compatible clone brands such as Predator, Champion, Generac, Duromax, Firman and Rato.

Will this starter motor fit my engine and which part numbers does it replace?

This unit is engineered to be compatible with many GX340 and GX390 family engines and popular clones. It replaces numerous OEM and aftermarket numbers, making it simpler to confirm fitment by cross-referencing your current part number.

• Compatible part numbers include SND0288, DB5B8, DB5B6, 410-52044 and 41052044.
• Also listed as 31210-ZE3-013, 31210-ZE3-023, 31210-ZE3-033 and related variations.
• Additional cross-references: 128000-3400, 128000-2750, 18513 and similar identifiers.

How much starting power does this motor deliver and are there limitations?

The starter produces approximately 450 watts of output, suitable for typical GX340/GX390 applications such as generators and light-duty engines. Because its power rating is moderate, it may not be adequate for very high-compression or heavy-duty engines (for example, some pressure washers and other high-power machines).

• Rated output: about 450 W—effective for most standard GX340/GX390 engines.
• Not recommended for some high-power or high-compression applications.
• Check your engine’s starting requirements before purchase to ensure compatibility.

What brands and machines commonly use this replacement starter?

This YAMAKATO starter is made to suit Honda GX340 and GX390 series engines and many clone-brand units. It’s a common replacement on a variety of portable generators, utility engines, and equipment that use 338cc–459cc engine families.

• Compatible brands: Honda and clone makers including Predator, Champion, Generac, Duromax, Firman, Rato.
• Common applications: portable generators (CPE, GP series), small industrial equipment and light-duty power units.
• Engine displacements covered: roughly 338cc up to about 459cc, depending on model.

What comes in the box and what quality standard does it meet?

You receive one starter motor with an integrated solenoid, packaged for safe delivery. YAMAKATO builds this unit to a 3A quality standard intended for above-listed generator and engine applications.

• Package contents: 1 x starter motor with solenoid in a protective box.
• Manufacturing note: produced to YAMAKATO 3A quality standard for engine-related generator use.
• Installation tip: verify electrical connections and mounting flange match your engine before tightening.

Who is this for: The YAMAKATO GX340/GX390 starter motor with solenoid is aimed at owners, DIY mechanics, and service technicians who need a dependable replacement for failing electric starters on small engines and portable generators. It’s best for standard-duty engines within the GX340/GX390 family and compatible clones; if you operate a high-power or heavy-compression machine, confirm the 450 W starter output meets your starting requirements before installing.