The Premarine 25HP 30HP 2-Stroke outboard motor (built on the legendary 6L2 / 61N engine platforms) is a worldwide commercial benchmark. Recognized for its exceptionally high power-to-weight ratio, mechanical simplicity, and field repairability, it remains a top choice for commercial fishing, workboats, and transport craft.

Key Technical Specifications

• Engine Type: In-line 2-Cylinder, 2-Stroke

• Displacement: 496 cc

• Bore x Stroke: 72.0 mm x 61.0 mm

• Full Throttle Operating Range: 4500 – 5500 RPM

• Fuel Induction System: Single or Twin Carburetor (depending on 25B / 25J variant)

• Ignition System: CDI (Capacitor Discharge Ignition)

• Fuel-to-Oil Ratio: 50:1 (Pre-mix)

• Dry Weight: ~52 kg (114 lbs)

• Starting System: Manual Pull Start (Electric Start options available on select variants)

Essential Maintenance & Replacement Parts

• Impeller: 6L4-44352-00

• Water Pump Repair Kit: 61N-W0078-11 / 61N-W0078-00

• Spark Plugs: NGK B7HS-10

• Thermostat: 6E5-12411-30

• Carburetor Assembly: 6L2-14301-00 / 6L2-14302-00

• CDI Unit Assembly: 61N-85540-00 / 6L2-85540-00

• Propeller (Standard 3-Blade): 9-7/8 x 10-F or 9-7/8 x 11-F

Aftermarket & Clone Engine Cross-Compatibility

The Yamaha 25HP 2-stroke design serves as the global manufacturing reference for commercial clone engines:

• Parts Interoperability:

  • Gearcase assemblies, lower unit drive shafts, crankshafts, pistons, and electrical modules across Parsun and Hidea 25HP 2-stroke models offer direct dimensional replacement with original Yamaha parts.

• PREMARINE Brand Compatibility:

  • PREMARINE provides a full range of OEM-spec replacement parts and complete engine assemblies based on the Yamaha 25HP 2-stroke (6L2/61N) platform.

  • PREMARINE parts (including carburetors, lower unit gearsets, water pump kits, CDI units, and propellers) feature 1:1 precision fitment and seamless cross-compatibility for both original Yamaha engines and aftermarket clone units.