Yamaha 1986-96 6 HP Outboard Specs & Maintenance
Built between 1986 and 1996, this 6 HP 2-cylinder, 2-stroke outboard is a legendary workhorse for skiffs, Jon boats, and tenders. Packing a punch with its 10 cubic inch (165 cc) displacement, this lightweight twin-cylinder motor delivers smooth idling and dependable power. Whether you are restoring a classic setup or maintaining your trusty weekend troller, our comprehensive technical specs and maintenance guides will keep your vintage 6 HP running like new for years to come.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 6 |
| Year Range | 1986-96 |
| Engine Type | CL 2-stroke |
| Cylinders | 2 |
| Displacement | 10 cu-in (165 cc) |
| Bore x Stroke | 1.97 x 1.65 in (50 x 42 mm) |
| Compression Ratio | 7.0:1 |
| Full Throttle RPM | 4000-5000 |
| Idle Speed (Neutral) RPM | 850-950 |
| Idle Speed (Trolling) RPM | 750-850 |
| 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) | 3-5 |
| Ignition Timing (Carb Pickup) | — |
| Ignition Timing (Full Advance) | 34-36 |
| 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) | 160 |
| Gear Oil Capacity (Oz) | 5.4 |
| Approximate Weight | 59-65 lbs (27-30 kg) |
| Battery CCA / Reserve | 210 (40) |
| Battery Reserve | 59 minutes |
| Tach Pole Setting | 4 |
| Test Propeller Part Number | YB-1625 |
| Test Propeller New Engine RPM | 4500-4700 |
Maintenance Summary
Keep this classic 2-stroke running smoothly by inspecting the lower unit oil annually and maintaining a fresh fuel mixture. For optimal ignition performance, install NGK B7HS-10 spark plugs gapped precisely to 0.035–0.039 inches (0.9–1.0 mm). Regular impeller replacements will prevent overheating and protect your engine.
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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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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