BILT HARD 420cc 15HP Gas Engine with Electric Start – 4-Stroke OHV Horizontal Shaft, Compatible Replacement for Honda GX390, Briggs & Stratton GX390, Kohler CH440, and Yamaha MZ/MX Series
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Product details
| Management number | 203285433 | Release Date | 2025/09/24 | List Price | $200.00 | Model Number | 203285433 | ||
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420cc 15HP Gas Engine with Electric Start
| Maximum Torque | 18.45ft.lbs @2500RPM | Compression Ratio | 8.2:1 |
| Bore × Stroke | 3.54 in x 2.6 in | Speed (max) | 3800 RPM |
| Shaft length | 3.48 in. | Shaft Diameter | 1 in. |
| PTO Shaft Keyway | 1/4 in. | Mounting Pattern | 7.72 L x 4.06 W-3.39 W in. |
| Weight | 82.9 pounds | Dimensions | 18.3''x14.4''x17.5'' |
| Manual | Download | Power Source | Gas Powered |
Experience Unleashed Power with Our 15HP Engine!
POWERFUL & RELIABLE ENGINE: This 420cc 4-stroke horizontal shaft gas engine delivers up to 15 HP, with a maximum torque of 18.45 ft-lbs at 2,500 RPM and a top speed of 3,800 RPM. It features a 1.2-gallon fuel tank and is engineered to meet and exceed industrial-grade quality standards for dependable, long-lasting performance. Note: Engine ships dry—please add gasoline and engine oil (not included) before starting.
SHAFT & MOUNTING SPECIFICATIONS: The crankshaft measures 1" in diameter and 3.48" in length, with a 3/8"-24 UNF tapped end and a 1/4" keyway. Mounting pattern: 7.72" (L) x 3.39" (W) – 4.06" (W). The engine runs smoothly and quietly, and supports Torch F6TC spark plugs with a gap of 0.027"–0.031". Compatible with unleaded gasoline (minimum 87+ octane, ethanol content <10% recommended).
SAFE & VERSATILE OPERATION: Equipped with a forced air-cooling and splash lubrication system to maintain optimal operating temperature and safety during extended use. A built-in low oil shutdown sensor protects the engine from damage due to insufficient lubrication. Ideal for a wide range of equipment including cement mixers, compressors, log splitters, water pumps, tillers, mowers, vacuums, and more.
EXCELLENT REPLACEMENT OPTION: This engine is a reliable replacement for popular models such as Honda GX340/GX390 (389cc), Briggs & Stratton GX340/GX390 (389cc), Kohler CH440/ECH440/ECH440LE (429cc), and Yamaha MZ360/MX360/MX400 (357–402cc).
IMPORTANT NOTE: EPA compliant. Each engine is oil-tested before packaging to ensure quality, so you may notice slight oil residue. Rest assured, your engine is 100% brand new and ready for use once properly fueled and oiled.
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