Yamaha 1995-96 28J HP Outboard Specs & Maintenance
Looking to keep your 1995-1996 28J HP outboard running at peak performance? Powered by a punchy 3-cylinder, 43 cubic inch (698cc) in-line 2-stroke block, this mid-90s workhorse is renowned for its impressive power-to-weight ratio and smooth operation. Whether you are performing a seasonal tune-up or troubleshooting performance issues, our comprehensive database delivers the technical specs and marine mechanic insights you need to keep your engine reliable on the water.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 28J |
| Year Range | 1995-96 |
| Engine Type | IL 2-stroke |
| Cylinders | 3 |
| Displacement | 43 cu-in (698 cc) |
| Bore x Stroke | 2.64 x 2.60 in (67 x 66 mm) |
| Compression Ratio | 6.0:1 |
| Full Throttle RPM | 4500-5500 |
| Idle Speed (Neutral) RPM | 750-850 |
| Idle Speed (Trolling) RPM | — |
| 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) | 6-8 ATDC |
| Ignition Timing (Carb Pickup) | 6-8 ATDC |
| Ignition Timing (Full Advance) | 24-28 |
| Fuel System | Carb |
| Starting System | Manual and/or Elec |
| 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 | 158 lbs (72 kg) |
| Battery CCA / Reserve | 210 (40) |
| Battery Reserve | 59 minutes |
| Tach Pole Setting | 6 |
| Test Propeller Part Number | — |
| Test Propeller New Engine RPM | — |
Maintenance Summary
Routine maintenance is key for this 3-cylinder 2-stroke. Always inspect and service your ignition system using NGK B7HS-10 spark plugs gapped precisely to 0.035–0.039 inches (0.9–1.0 mm). Combine fresh fuel, proper 2-stroke oil ratios, and regular gearcase lube changes for bulletproof reliability.
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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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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