Yamaha 1989-92 30 HP Outboard Specs & Maintenance
Built between 1989 and 1992, this 30 HP two-cylinder inline 2-stroke outboard is a lightweight powerhouse beloved by DIY marine enthusiasts. Packing a punch with its 496cc (30 cu in) displacement, this classic motor delivers reliable performance for small fishing boats and runabouts alike. Whether you’re restoring a vintage rig or keeping a trusty workhorse running, our database provides the specs, tuning guides, and maintenance data you need to stay on the water.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 30 |
| Year Range | 1989-92 |
| Engine Type | IL 2-stroke |
| Cylinders | 2 |
| Displacement | 30 cu-in (496 cc) |
| Bore x Stroke | 2.83 x 2.40 cu-in (72 x 61 mm) |
| Compression Ratio | 7.0:1 |
| Full Throttle RPM | 4500-5500 |
| Idle Speed (Neutral) RPM | 850-950 |
| Idle Speed (Trolling) RPM | 750-850 |
| Spark Plug (NGK) | B7HS |
| Spark Plug (Champion) | L82C |
| Spark Plug Gap | 0.020-0.24 in (0.5-0.6 mm) |
| Ignition System | CDI |
| Ignition Timing (Idle) | — |
| Ignition Timing (Carb Pickup) | — |
| Ignition Timing (Full Advance) | 24-26 |
| 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) | 180 |
| Gear Oil Capacity (Oz) | 6.1 |
| 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 | 5000-5200 |
Maintenance Summary
Keeping this twin-cylinder 2-stroke running smoothly requires simple, regular care. Inspect fuel lines, run proper oil mixes, and refresh ignition components season to season. For optimal firing, install NGK B7HS spark plugs gapped precisely between 0.020–0.024 inches (0.5–0.6 mm) for reliable starts and 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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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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