Yamaha 1984-93 175 HP Outboard Specs & Maintenance
Built between 1984 and 1993, this robust 175 HP 90° V6 2-stroke outboard remains a legendary choice for vintage boating enthusiasts. Boasting a heavy-duty 158 cubic inch (2596 cc) displacement, it delivers exceptional hole-shot torque and bulletproof mid-range power for classic hulls. Whether you are restoring a retro speedcraft or servicing a daily workhorse, our database provides the factory specs and technical guides needed to keep your classic outboard running strong.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 175 |
| Year Range | 1984-93 |
| 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) | B8HS-10 |
| Spark Plug (Champion) | L78C |
| 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 | 392-430 lbs (178-195 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 | 4900-5100 |
Maintenance Summary
Keep your 175 HP V6 firing reliably by running fresh oil-fuel mixes and checking ignition timing. Routine tune-ups require NGK B8HS-10 spark plugs set to a gap of 0.035–0.039 inches (0.9–1.0 mm). Inspect lower unit lube and water pump impellers seasonally for peak 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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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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