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40HP
PREMARINE
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The PREMARINE 40G 40J (often categorized under Yamaha’s commercial Enduro series) is a robust, two-stroke, two-cylinder marine outboard engine designed for heavy-duty commercial applications, workboats, and long-range fishing transport. Known for its high reliability and simple mechanical layout, it thrives in harsh saltwater environments and areas where fuel quality varies.
Technical Specifications
Specification | Details |
Engine Type | Inline 2-Cylinder, 2-Stroke |
Displacement | ~703 cc |
Bore x Stroke | 80.0 mm x 70.0 mm |
Max Output | 40 HP (29.4 kW) @ 5000 RPM |
Full Throttle Operating Range | 4500 – 5500 RPM |
Fuel Induction System | Loop charged via single / dual carburetor setup |
Starting System | Manual (pull start) or Electric Start (model dependent) |
Control System | Tiller Handle or Remote Control |
Gear Ratio | 2.00:1 (26:13) |
Trim & Tilt | Manual Tilt |
Fuel Mix Ratio | 50:1 (Gasoline : TC-W3 2-stroke oil) after break-in |
Transom Shaft Lengths | Short (S: 15"), Long (L: 20") |
Key Features & Operational Highlights
Commercial Grade Durability: Uses high-grade aluminum alloy with multi-layer anti-corrosion coatings, zinc sacrificial anodes, and stainless steel fasteners for marine corrosion resistance.
Simple Carburetion & Fuel System: Easy to service in remote areas with basic hand tools; tolerant of varying gasoline octane ratings and ethanol blends.
Loop-Charged Combustion: Enhances fuel/air mixing for smoother idling, improved torque across the mid-range RPM band, and better fuel efficiency relative to older cross-flow designs.
CDI Ignition System: Capacitor Discharge Ignition ensures quick cold starts, accurate timing, and low maintenance with no mechanical breaker points to replace.
Common OEM Replacement Parts
Impeller / Water Pump Kit: 6H4-44352-02 / 61N-W0078-11
Carburetor Assembly / Repair Kit: 6F6-14301-00 / 6F6-W0093-00
CDI Unit: 6F6-85540-00 / 61N-85540-00
Propeller Shaft / Drive Shaft: 664-45511-00 / 664-45611-00
Thermostat: 6E5-12411-30
Aftermarket & Clone Engine Cross-Compatibility
The Yamaha 40G / 40HP 2-Stroke platform serves as the standard design pattern for numerous global aftermarket brands and clone engine manufacturers.
PREMARINE Brand Compatibility: PREMARINE offers a complete range of direct-fit aftermarket replacement components and clone engines engineered to match Yamaha 40G OEM specifications. Key PREMARINE offerings include:
Direct replacement lower units, gearboxes, and gear sets (Pinion, Forward, Reverse).
Electrical ignition assemblies, including CDI boxes, charge coils, and ignition coils.
Complete water pump rebuild kits, housings, and high-durability impellers.
Engine overhaul parts, including pistons, ring sets, crankshafts, and gasket sets designed for seamless installation on Yamaha 40G blocks.
