Yamaha 1984-96 2 HP Outboard Specs & Maintenance
Compact, reliable, and virtually indestructible, the 1984-1996 2 HP single-cylinder 2-stroke outboard is a classic piece of portable marine engineering. Displacing 2.6 cubic inches (43cc), this lightweight inline motor remains a favorite for dinghies and small tenders. Whether you are performing a seasonal tune-up or restoring a vintage unit, our database provides the essential specs, spark plug settings, and technical data to keep your outboard running flawlessly.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 2 |
| Year Range | 1984-96 |
| Engine Type | IL 2-stroke |
| Cylinders | 1 |
| Displacement | 2.6 cu-in (43 cc) |
| Bore x Stroke | 1.54 x 1.42 in (39 x 36 mm) |
| Compression Ratio | 7.4:1 |
| Full Throttle RPM | 4000-5000 |
| Idle Speed (Neutral) RPM | 1100-1200 |
| Idle Speed (Trolling) RPM | — |
| Spark Plug (NGK) | B5HS |
| Spark Plug (Champion) | L90C |
| Spark Plug Gap | 0.024-0.028 in (0.6-0.7 mm) |
| Ignition System | |
| Ignition Timing (Idle) | 16-20 |
| Ignition Timing (Carb Pickup) | — |
| Ignition Timing (Full Advance) | — |
| 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) | 45 |
| Gear Oil Capacity (Oz) | 1.5 |
| Approximate Weight | 22 lbs (10 kg) |
| Battery CCA / Reserve | n/a |
| Battery Reserve | n/a |
| Tach Pole Setting | 4 |
| Test Propeller Part Number | YB-1601 |
| Test Propeller New Engine RPM | 4400-4700 |
Maintenance Summary
Keeping your 2 HP 2-stroke running reliably requires basic, consistent maintenance. Always mix fresh fuel with quality 2-cycle marine oil, flush the cooling passages after use, and check the lower unit gear lube annually. For crisp ignition, install an NGK B5HS spark plug gapped to 0.024–0.028 inches (0.6–0.7 mm).
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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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.
Non-Affiliation Notice: VintageMotorSpecs.com is an independent historical reference database and is not affiliated, associated, authorized, endorsed by, or in any way officially connected with Outboard Marine Corporation (OMC), Mercury Marine, Yamaha, Honda, or any of their subsidiaries or affiliates. All product names, trademarks, and registered trademarks are property of their respective owners.