Yamaha 1993-95 15 HP Outboard Specs & Maintenance
Renowned for its exceptional power-to-weight ratio and bulletproof reliability, the 1993-1995 15 HP 2-stroke outboard remains a top choice for vintage boat enthusiasts. Featuring a compact 246cc inline two-cylinder block, this motor offers spirited acceleration and easy serviceability. Whether you are servicing a fishing skiff or restoring a classic tender, our technical database provides the factory specifications, tuning tips, and maintenance specs required to keep your outboard performing flawlessly.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 15 |
| Year Range | 1993-95 |
| Engine Type | IL 2-stroke |
| Cylinders | 2 |
| Displacement | 15 cu-in (246 cc) |
| Bore x Stroke | 2.20 x 1.97 in (56 x 50 mm) |
| Compression Ratio | 6.8:1 |
| Full Throttle RPM | 4500-5500 |
| Idle Speed (Neutral) RPM | 850-950 |
| Idle Speed (Trolling) RPM | 670-770 |
| Spark Plug (NGK) | B7HS-10 |
| Spark Plug (Champion) | L82C |
| Spark Plug Gap | 0.035-0.039 in (0.9-1.0 mm) |
| Ignition System | CDI |
| Ignition Timing (Idle) | 4-6 |
| Ignition Timing (Carb Pickup) | 9-11 |
| Ignition Timing (Full Advance) | 29-31 |
| Fuel System | Carb |
| Starting System | Man or Man & Elec |
| Oil Injection System | Pre-Mix 100:1 |
| Injection Oil Ratio | Pre-Mix 100:1 |
| Gear Oil Capacity (mL/cc) | 185 |
| Gear Oil Capacity (Oz) | 6.3 |
| Approximate Weight | 80-90 lbs (36-41 kg) |
| Battery CCA / Reserve | 210 (40) |
| Battery Reserve | 59 minutes |
| Tach Pole Setting | 4 |
| Test Propeller Part Number | YB-1619 |
| Test Propeller New Engine RPM | 5200-5400 |
Maintenance Summary
Proper care keeps this 246cc twin running strong season after season. Flush the cooling system regularly, replace gearcase lube annually, and inspect fuel lines. For crisp ignition and reliable starts, install NGK B7HS-10 spark plugs gapped precisely to 0.035-0.039 inches (0.9-1.0 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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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.
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