Yamaha 1987-95 225 HP Outboard Specs & Maintenance
The 1987-1995 225 HP 2-stroke outboard is a powerhouse built on a robust 158-cubic-inch (2596 cc) 90-degree V6 block. Famous for its raw torque and reliability, this high-performance motor remains a favorite among vintage marine enthusiasts. Whether you are restoring a classic hull or keeping your vessel in top shape, our database delivers the exact factory specs, tuning data, and service guidelines you need.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 225 |
| Year Range | 1987-95 |
| Engine Type | 90 LV 2-st |
| Cylinders | 6 |
| Displacement | 158 cu-in (2596 cc) |
| Bore x Stroke | |
| Compression Ratio | |
| Full Throttle RPM | 5000-6000 |
| Idle Speed (Neutral) RPM | 725-775 |
| Idle Speed (Trolling) RPM | 575-625 |
| Spark Plug (NGK) | BR9HS-10 |
| Spark Plug (Champion) | QL77JC4 |
| Spark Plug Gap | 0.035-0.039 in (0.9-1.0 mm) |
| Ignition System | CDI Micro |
| Ignition Timing (Idle) | 4-8 ATDC |
| Ignition Timing (Carb Pickup) | 4-8 ATDC |
| Ignition Timing (Full Advance) | 20-24 |
| Fuel System | Carb |
| Starting System | Electric |
| Oil Injection System | Precision Blend |
| Injection Oil Ratio | Precision Blend |
| Gear Oil Capacity (mL/cc) | 980 |
| Gear Oil Capacity (Oz) | 33.1 |
| Approximate Weight | |
| Battery CCA / Reserve | 380 (100) |
| Battery Reserve | 124 minutes |
| Tach Pole Setting | 12 |
| Test Propeller Part Number | YB-1626 |
| Test Propeller New Engine RPM | 5450-5650 |
Maintenance Summary
Routine maintenance is critical for this 2596cc 2-stroke engine. Always inspect fuel lines, check oil injection systems, and replace water pump impellers annually. For clean combustion, install NGK BR9HS-10 spark plugs gapped precisely between 0.035-0.039 inches (0.9-1.0 mm) to ensure smooth idling and maximum top-end performance.
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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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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