Yamaha 1994-95 150 HP Outboard Specs & Maintenance
Built for raw power and long-term reliability, the 1994-1995 150 HP 90° V6 two-stroke outboard remains a favorite among DIY mechanics and boating enthusiasts. Packing a punch with its 158 cu in (2596 cc) 6-cylinder powerhead, this marine engine delivers exceptional hole-shot performance. Whether you are performing routine service or a complete overhaul, our database provides the vital specs and technical data to keep your outboard running strong.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 150 |
| 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 | |
| Full Throttle RPM | 4500-5500 |
| Idle Speed (Neutral) RPM | 675-725 |
| Idle Speed (Trolling) RPM | 550-600 |
| Spark Plug (NGK) | BR8HS-10 |
| Spark Plug (Champion) | QL78C |
| Spark Plug Gap | 0.035-0.039 in (0.9-1.0 mm) |
| Ignition System | |
| Ignition Timing (Idle) | 6-8 ATDC |
| Ignition Timing (Carb Pickup) | 5-7 ATDC |
| Ignition Timing (Full Advance) | 23-25 |
| 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) | 980 |
| Gear Oil Capacity (Oz) | 33.1 |
| Approximate Weight | 392-434 lbs (178-197 kg) |
| Battery CCA / Reserve | 380 (70) |
| Battery Reserve | 124 minutes |
| Tach Pole Setting | 12 |
| Test Propeller Part Number | YB-1626 |
| Test Propeller New Engine RPM | 4600-4800 |
Maintenance Summary
Maintain peak two-stroke performance by keeping your ignition and fuel systems dialed in. Always use fresh NGK BR8HS-10 spark plugs gapped precise to 0.035–0.039 inches (0.9–1.0 mm). Regular lower-unit gear lube changes and water pump impeller inspections will ensure your 2.6L V6 stays cool and dependable.
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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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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