YAMAKATO GX340/GX390 Starter Motor with Solenoid — Direct-Replace 450W for Honda & Clones

YAMAKATO GX340/GX390 starter motor with integrated solenoid is a direct-replacement electric starter designed to restore reliable push-button starts on compatible Honda and clone small engines.

If your generator, pressure washer, or replacement engine no longer cranks, this YAMAKATO starter motor delivers a compact, ready-to-install solution engineered for GX-series 338–459cc engines and many common clone units. It matches common OEM mounting patterns and electrical connections so installers can swap the unit with minimal modification. Note: rated output is 450W, which is appropriate for most generator and lawn-equipment applications but not for very high-demand starters such as some commercial pressure washers.

Which engines and models is this starter compatible with?

This starter is designed to fit Honda GX340 and GX390 platforms plus many aftermarket clone engines from popular manufacturers. Compatibility includes specific part numbers and a long list of engine displacements commonly used in generators and heavy-duty equipment.

• Works with Honda GX340, GX390 and clones (338cc–459cc ranges)
• Common clone brands: Predator, Champion, Generac, Duromax, Firman, Rato
• Compatible with many generator models (CPE, GP series) and other utility engines
• Matches listed OEM part numbers for straightforward replacement

How do I confirm the replacement will fit my machine?

Verify fit by comparing mounting bolt pattern, electrical terminals, and physical dimensions against your existing starter. Confirm the listed compatible part numbers and engine model numbers to reduce the chance of mismatch.

• Compare part numbers: SND0288, 31210-ZE3-013, 128000-3400, etc.
• Check mounting bolt spacing and shaft engagement against your old starter
• Ensure the engine displacement and brand align with the compatibility list
• Confirm starter voltage and solenoid terminal arrangement match your wiring harness

What performance and limitations should I expect from this starter?

The unit delivers about 450 watts of actual power—suitable for most consumer and industrial small engines but not intended for oversized starter demands. It includes a built-in solenoid and is packaged ready for installation.

• Rated output: approximately 450W, adequate for most generators and engines listed
• Includes integrated solenoid to simplify wiring and installation
• Not recommended for very high-power applications like some commercial pressure washers
• Supplied as a single starter motor with solenoid in the box

What comes in the box and how is the quality assured?

The product ships as a single starter motor assembled with its solenoid and packaged by YAMAKATO to their 3A quality standard. The listing provides multiple cross-reference part numbers so you can check against OEM and aftermarket catalogs.

• Package contents: 1 x starter motor with solenoid in box
• YAMAKATO 3A quality standard for durability and fitment consistency
• Cross-reference part numbers included for verification before purchase
• Intended for use with generators, engines and equipment listed in compatibility notes

Who this is for: This starter motor is aimed at DIY mechanics, small-engine repair shops, fleet maintenance teams, and equipment owners who need a cost-effective, drop-in replacement for Honda GX340/GX390 and common clone engines. Choose this unit if you require an integrated solenoid, OEM-style mounting, and compatibility with popular generator and utility engine models—but avoid it if your application requires a higher-wattage starter for unusually large or high-draw engines.