Yamaha 1993-96 4 HP Outboard Specs & Maintenance
Built for durability and lightweight portability, the 1993-1996 4 HP 2-stroke commercial outboard is a classic single-cylinder workhorse. Powered by a compact 83cc (5.0 cu. in.) displacement engine, this motor is an ideal choice for dinghies, skiffs, and auxiliary power. Whether you are restoring a vintage unit or servicing your weekend runner, our database provides the key technical specs DIY mechanics need to keep this reliable engine firing smoothly.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 4 |
| Year Range | 1993-96 |
| Engine Type | CL 2-stroke |
| Cylinders | 1 |
| Displacement | 5.0 cu-in (83 cc) |
| Bore x Stroke | 1.97 x 1.65 in (50 x 42 mm) |
| Compression Ratio | 7.0:1 |
| Full Throttle RPM | 4500-5500 |
| Idle Speed (Neutral) RPM | 1100-1200 |
| Idle Speed (Trolling) RPM | 950-1050 |
| Spark Plug (NGK) | B7HS |
| Spark Plug (Champion) | L82C |
| Spark Plug Gap | 0.024-0.028 in (0.6-0.7 mm) |
| Ignition System | CDI |
| Ignition Timing (Idle) | 3-9 |
| Ignition Timing (Carb Pickup) | — |
| Ignition Timing (Full Advance) | 25-31 |
| Fuel System | Carb |
| Starting System | Manual |
| Oil Injection System | Pre-Mix 100:1 |
| Injection Oil Ratio | Pre-Mix 100:1 |
| Gear Oil Capacity (mL/cc) | 105 |
| Gear Oil Capacity (Oz) | 3.6 |
| Approximate Weight | 44-47 lbs (20-22 kg) |
| Battery CCA / Reserve | n/a |
| Battery Reserve | n/a |
| Tach Pole Setting | 4 |
| Test Propeller Part Number | — |
| Test Propeller New Engine RPM | — |
Maintenance Summary
Keeping this 5.0 cu. in. 2-stroke running strong requires basic routine care. Inspect your cooling system regularly and gap a fresh NGK B7HS spark plug to 0.024–0.028 inches (0.6–0.7 mm) to guarantee clean ignition, smooth idling, and easy pull-starts on the water.
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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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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