Yamaha 1987-93 80J HP Outboard Specs & Maintenance
Built between 1987 and 1993, the 80J HP outboard is a legendary workhorse in the marine world. Featuring a robust 4-cylinder, 2-stroke design with a displacement of 106 cubic inches (1730 cc), this engine delivers punchy low-end torque and dependable performance for classic boats. Whether you’re restoring a vintage craft or keeping your daily runner turning, our comprehensive specs guide helps DIY mechanics tune, service, and maintain this reliable mid-range powerhead with confidence.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 80J |
| Year Range | 1987-93 |
| Engine Type | 90 LV 2-st |
| Cylinders | 4 |
| Displacement | 106 cu-in (1730 cc) |
| Bore x Stroke | 3.54 x 2.68 in (90 x 68 mm) |
| Compression Ratio | 6.7:1 |
| Full Throttle RPM | 4500-5500 |
| Idle Speed (Neutral) RPM | 600-700 |
| Idle Speed (Trolling) RPM | — |
| Spark Plug (NGK) | B8HS-10 |
| Spark Plug (Champion) | L78C |
| 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) | 3-5 ATDC |
| Ignition Timing (Full Advance) | 24-26 |
| Fuel System | Carb |
| Starting System | Electric |
| Oil Injection System | Precision Blend |
| Injection Oil Ratio | Precision Blend |
| Gear Oil Capacity (mL/cc) | n/a |
| Gear Oil Capacity (Oz) | n/a |
| Approximate Weight | 340 lbs (154 kg) |
| Battery CCA / Reserve | 380 (70) |
| Battery Reserve | 124 minutes |
| Tach Pole Setting | 12 |
| Test Propeller Part Number | — |
| Test Propeller New Engine RPM | — |
Maintenance Summary
Keeping your 80J running smooth requires proper ignition maintenance. Always use NGK B8HS-10 spark plugs gapped precisely to 0.035–0.039 inches (0.9–1.0 mm). Regular fuel system checks, fresh oil mixing, and seasonal lower unit gear lube changes will ensure your 1730cc 2-stroke delivers reliable power all season long.
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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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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