Yamaha 1994-95 140J HP Outboard Specs & Maintenance
Looking to keep your 1994-1995 140J HP 2-stroke outboard running at peak performance? Built on a robust 158 cubic inch (2596cc) 90-degree V6 block, this classic six-cylinder powerhead delivers legendary hole-shot torque and rock-solid reliability. Whether you’re restoring a vintage rig or handling routine seasonal service, our comprehensive database provides the exact mechanical specs, spark plug details, and DIY maintenance guides you need to tackle any repair with confidence.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 140J |
| Year Range | 1994-95 |
| Engine Type | 90 LV 2-st |
| Cylinders | 6 |
| Displacement | 158 cu-in (2596 cc) |
| Bore x Stroke | 3.54 x 2.68 in (90 x 68 mm) |
| Compression Ratio | 5.9:1 |
| Full Throttle RPM | 4500-5500 |
| Idle Speed (Neutral) RPM | 675-725 |
| Idle Speed (Trolling) RPM | — |
| Spark Plug (NGK) | BR8HS-10 |
| Spark Plug (Champion) | QL78C |
| 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) | 5-7 ATDC |
| Ignition Timing (Full Advance) | 21-23 |
| 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 | 398 lbs (180 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
Routine maintenance is essential for this 2.6L V6 two-stroke. Keep your ignition smooth by installing NGK BR8HS-10 spark plugs gapped to 0.035–0.039 inches (0.9–1.0 mm). Always mix fresh fuel, inspect gear lube, and verify cooling water flow to ensure maximum engine longevity.
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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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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