Yamaha 1996 25 HP Outboard Specs & Maintenance
The 1996 25 HP 2-stroke outboard remains a legendary workhorse among boating enthusiasts and fishermen alike. Powered by a robust 2-cylinder, 496 cc (30 cu. in.) inline engine, this twin-cylinder lightweight delivers an unbeatable power-to-weight ratio and bulletproof reliability. Whether you’re restoring a classic skiff or servicing your daily angler, our database provides the exact specs, spark plug gaps, and service details to keep this motor running strong.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 25 |
| Year Range | 1996 |
| Engine Type | IL 2-stroke |
| Cylinders | 2 |
| Displacement | 30 cu-in (496 cc) |
| Bore x Stroke | 2.83 x 2.40 in (72 x 61 mm) |
| Compression Ratio | 6.2:1 |
| Full Throttle RPM | 4500-5500 |
| Idle Speed (Neutral) RPM | 1100-1200 |
| Idle Speed (Trolling) RPM | 900-1000 |
| Spark Plug (NGK) | B7HS-10 |
| Spark Plug (Champion) | L82C |
| Spark Plug Gap | 0.035-0.039 in (0.9-1.0 mm) |
| Ignition System | CDI |
| Ignition Timing (Idle) | 0-4 ATDC |
| Ignition Timing (Carb Pickup) | — |
| Ignition Timing (Full Advance) | 20-24 |
| Fuel System | Carb |
| Starting System | Man or Man & Elec |
| Oil Injection System | Pre-Mix 100:1 |
| Injection Oil Ratio | Pre-Mix 100:1 |
| Gear Oil Capacity (mL/cc) | 320 |
| Gear Oil Capacity (Oz) | 10.8 |
| Approximate Weight | 115-126 lbs (52-57 kg) |
| Battery CCA / Reserve | 210 (40) |
| Battery Reserve | 59 minutes |
| Tach Pole Setting | 4 |
| Test Propeller Part Number | YB-1621 |
| Test Propeller New Engine RPM | 4200-4400 |
Maintenance Summary
Keep your 1996 25 HP 2-stroke running smoothly with routine maintenance. Always run correctly gapped NGK B7HS-10 spark plugs set to 0.035–0.039 inches (0.9–1.0 mm). Inspect the water pump impeller annually, mix fresh fuel correctly, and grease all pivot points for dependable performance.
Disclaimer & Information Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only. Always verify data against an official OEM service manual prior to ordering parts or executing repairs. VintageMotorSpecs.com assumes no liability for repair errors, equipment damage, or personal injury resulting from the use of this data.
Spot an error or discrepancy in these specs? Please contact us with your engine details so we can update our database.
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