Yamaha 1994-96 50 HP Outboard Specs & Maintenance
Looking to keep your 1994-1996 50 HP 3-cylinder 2-stroke outboard running at peak performance? Built with a robust 52 cubic inch (849cc) inline powerhead, this mid-range workhorse is legendary for its punchy hole-shot and lasting reliability. Whether you’re troubleshooting a misfire or performing routine seasonal service, our database provides the precise specs, spark plug settings, and expert technical guidance DIY mechanics need to maintain this classic engine.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 50 |
| Year Range | 1994-96 |
| Engine Type | IL 2-stroke |
| Cylinders | 3 |
| Displacement | 52 cu-in (849 cc) |
| Bore x Stroke | 2.83 x 2.74 in (72.0 x 69.5 mm) |
| Compression Ratio | 6.33.1 |
| Full Throttle RPM | 4500-5500 |
| Idle Speed (Neutral) RPM | 750-850 |
| Idle Speed (Trolling) RPM | 550-650 |
| Spark Plug (NGK) | BR8HS-10 |
| Spark Plug (Champion) | L78C |
| Spark Plug Gap | 0.035-0.039 in (0.9-1.0 mm) |
| Ignition System | CDI Micro |
| Ignition Timing (Idle) | 6-8 ATDC |
| Ignition Timing (Carb Pickup) | 6-8 ATDC |
| Ignition Timing (Full Advance) | 21-23 |
| Fuel System | Carb |
| Starting System | Manual and/or Elec |
| Oil Injection System | PB or 50:1 PM |
| Injection Oil Ratio | PB or 50:1 PM |
| Gear Oil Capacity (mL/cc) | 500 |
| Gear Oil Capacity (Oz) | 16.9 |
| Approximate Weight | 205-225 lbs (93-102 kg) |
| Battery CCA / Reserve | 380 (70) |
| Battery Reserve | 124 minutes |
| Tach Pole Setting | 6 |
| Test Propeller Part Number | YB-1620 |
| Test Propeller New Engine RPM | 4950-5150 |
Maintenance Summary
Keep this 849cc 3-cylinder engine running smooth with routine service. Always install properly gapped NGK BR8HS-10 spark plugs set to 0.035–0.039 inches (0.9–1.0 mm) for clean combustion. Regularly inspect the water pump impeller, refresh the lower unit gear lube, and use fresh fuel to ensure peak power.
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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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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