Yamaha 1987-96 30 HP Outboard Specs & Maintenance
Built between 1987 and 1996, this 30 HP inline 3-cylinder 2-stroke outboard is a legendary powerhouse for mid-sized fishing boats and skiffs. Featuring a punchy 496cc displacement, it is renowned for smooth power delivery and rock-solid reliability. Whether you are restoring a classic or maintaining your daily angler, our database provides the exact factory specifications and repair insights to keep this classic motor running strong for decades.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 30 |
| Year Range | 1987-96 |
| Engine Type | IL 2-stroke |
| Cylinders | 3 |
| Displacement | 30 cu-in (496 cc) |
| Bore x Stroke | 2.34 x 2.34 in (59.5 x 59.5 mm) |
| Compression Ratio | 6.8:1 |
| Full Throttle RPM | 4500-5500 |
| Idle Speed (Neutral) RPM | 670-800 |
| Idle Speed (Trolling) RPM | 600-700 |
| 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) | 4-6 ATDC |
| Ignition Timing (Carb Pickup) | 1-3 ATDC |
| Ignition Timing (Full Advance) | 24-26 |
| Fuel System | Carb |
| Starting System | Manual and/or Elec |
| Oil Injection System | Precision Blend |
| Injection Oil Ratio | PB oil injected |
| Gear Oil Capacity (mL/cc) | 200 |
| Gear Oil Capacity (Oz) | 6.8 |
| Approximate Weight | 130-148 lbs (59-67 kg) |
| Battery CCA / Reserve | 210 (40) |
| Battery Reserve | 59 minutes |
| Tach Pole Setting | 6 |
| Test Propeller Part Number | YB-1621 |
| Test Propeller New Engine RPM | 5250-5450 |
Maintenance Summary
Proper care keeps this inline-three running like new. Always run fresh fuel mixed with quality 2-stroke oil and inspect the cooling impeller annually. For optimal ignition, install fresh NGK B7HS-10 spark plugs set to a gap of 0.035–0.039 inches (0.9–1.0 mm) to ensure crisp throttle response.
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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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.
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