Products Description
GX390 Motor
389cc 4-Stroke OHV Commercial Engine
Original Honda GX390 power unit – 389cc single-cylinder, 4-stroke OHV engine with horizontal shaft. Delivers 11.7 HP (8.7kW) at 3600 rpm, suitable for generators, pressure washers, pumps, and construction equipment. Features Digital CDI ignition with variable timing, cast iron cylinder sleeve, automatic decompression, and Oil Alert protection. Ready-to-run unit includes recoil starter, air cleaner, muffler, and fuel tank.
Technical Profiles & Materials
Digital CDI Ignition – Variable timing system optimizes spark for high power output, reduced fuel consumption, and lower emissions across the RPM range .
Commercial-Grade Durability – Cast iron cylinder sleeve, forged steel crankshaft, and precision-engineered components ensure long-term reliability in heavy-duty applications .
OHV Efficiency – Overhead valve design enhances combustion efficiency, delivering optimal power transfer and improved fuel economy .
Easy Starting – Automatic decompression system reduces recoil effort. Optional electric start available. Oil Alert system shuts down engine to prevent damage from low oil .
Low Vibration & Noise – Heavy-duty balancer shaft, helical cut gears, and improved piston design reduce mechanical noise and vibration by up to 5dB .
Technical Specifications
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Products Application
Generators
Powers 5-8KW portable and standby generator sets. Digital CDI ignition ensures stable 50/60Hz frequency output. Oil Alert prevents low-oil damage during extended runtime .
Pressure Washers & Pumps
Maintains rated flow and pressure under continuous load. Commercial-grade construction withstands high-hour operation.
Construction Equipment
OEM power unit for compactors, tillers, and mixers. Heavy-duty balancer shaft reduces operator fatigue from vibration.
Quality and Craftsmanship Details
Products Package
About Us
As a premier garden machinery parts supplier, Jiaxing Norsun Trading Co., Ltd. bridges global distributors with over 100 vetted China manufacturers. We streamline your B2B supply chain through strict quality control, flexible production, and factory-direct wholesale pricing. Partner with us for reliable, high-volume sourcing of precision-engineered outdoor power equipment components.
Trusted Partnership Power
YOUR PROFESSIONAL ONE-STOP SOURCE
FOR 10000+ OUALITY PARTS
Verified Factory Excellence
BACKED BY 200+ TRUSTED FACTORY PARTNERS
Production process
Quality control
Expo experience
Customer Reviews
FAQ
Q: How to verify this engine fits my equipment?
A:Check current engine model code on housing or equipment spec sheet. GX390 fits standard 389cc Honda mounting patterns. Compatible with most 5-8KW generators, pumps, and construction equipment originally powered by GX340/GX390. For clone replacements (Predator 420, 188F), verify bolt pattern and PTO shaft dimensions.
Q: What maintenance is required?
A: Oil change every 100 hours (1.1L SAE 10W-30). Air filter service every 50 hours. Spark plug replacement (BPR6ES / W20EPR-U) annually . Use fresh unleaded gasoline (86+ octane). For ethanol fuel, use fuel stabilizer to prevent carburetor clogging .
Q: What's the MOQ and lead time?
MOQ 100 PCS. Delivery 7-14 days. Neutral export carton packaging.
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