Yamaha 1994-96 140 HP Outboard Specs & Maintenance
Built for power and reliability, the 1994-1996 140 HP 2-stroke outboard remains a favorite among boating enthusiasts. Featuring a rugged 90-degree V4 block packing 106 cubic inches (1730 cc) of displacement, this workhorse delivers exceptional hole-shots and top-end performance. Whether you’re restoring a classic hull or performing routine service, our technical database provides the exact specs, spark plug gaps, and maintenance insights you need to keep this legendary 4-cylinder engine running smoothly.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 140 |
| Year Range | 1994-96 |
| Engine Type | 90 LV 2-st |
| Cylinders | 4 |
| Displacement | 106 cu-in (1730 cc) |
| Bore x Stroke | |
| Compression Ratio | |
| Full Throttle RPM | 5000-6000 |
| Idle Speed (Neutral) RPM | 700-800 |
| Idle Speed (Trolling) RPM | 600-700 |
| Spark Plug (NGK) | BR9HS-10 |
| Spark Plug (Champion) | QL77CJ4 |
| 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) | 21-23 |
| Fuel System | Carb |
| Starting System | Electric |
| Oil Injection System | PB or 50:1 PM |
| Injection Oil Ratio | PB or 50:1 PM |
| Gear Oil Capacity (mL/cc) | 760 |
| Gear Oil Capacity (Oz) | 25.7 |
| Approximate Weight | |
| Battery CCA / Reserve | 380 (70) |
| Battery Reserve | 124 minutes |
| Tach Pole Setting | 12 |
| Test Propeller Part Number | YB-1624 |
| Test Propeller New Engine RPM | 5200-5400 |
Maintenance Summary
Keeping your 140 HP V4 healthy requires regular ignition and fuel system care. Always inspect and replace your NGK BR9HS-10 spark plugs, setting the gap precisely between 0.035 and 0.039 inches (0.9–1.0 mm). Proper gapping ensures reliable starting, smooth idling, and maximum 2-stroke performance 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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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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