Yamaha 1987-94 35J HP Outboard Specs & Maintenance
Produced between 1987 and 1994, the 35J HP outboard is a standout 3-cylinder, inline 2-stroke engine built for reliable marine performance. Packing a punch with its 43 cubic inch (698cc) displacement, this lightweight workhorse delivers smooth power and exceptional torque for fishing boats and runabouts alike. Whether you’re restoring a classic setup or performing routine DIY service, our comprehensive database provides the technical specs, maintenance guides, and expert advice needed to keep your 35J running strong.
Complete Technical Specifications
| Specification | Details |
|---|---|
| Model / Horsepower | 35J |
| Year Range | 1987-94 |
| Engine Type | IL 2-stroke |
| Cylinders | 3 |
| Displacement | 43 cu-in (698 cc) |
| Bore x Stroke | 2.64 x 2.60 in (67 x 66 mm) |
| Compression Ratio | 6.0:1 |
| Full Throttle RPM | 4500-5500 |
| Idle Speed (Neutral) RPM | 750-850 |
| Idle Speed (Trolling) RPM | — |
| Spark Plug (NGK) | B8HS-10 |
| Spark Plug (Champion) | L78C |
| Spark Plug Gap | 0.035-0.039 in (0.9-1.0 mm) |
| Ignition System | CDI |
| Ignition Timing (Idle) | 4-6 ATDC |
| Ignition Timing (Carb Pickup) | 0-2 ATDC |
| Ignition Timing (Full Advance) | 24-26 |
| Fuel System | Carb |
| Starting System | Electric |
| Oil Injection System | Precision Blend |
| Injection Oil Ratio | Precision Blend |
| Gear Oil Capacity (mL/cc) | n/a |
| Gear Oil Capacity (Oz) | n/a |
| Approximate Weight | 170 lbs (77 kg) |
| Battery CCA / Reserve | 210 (40) |
| Battery Reserve | 59 minutes |
| Tach Pole Setting | 6 |
| Test Propeller Part Number | — |
| Test Propeller New Engine RPM | — |
Maintenance Summary
Keeping your 1987–94 35J running smoothly requires regular ignition and fuel system checks. Ensure optimal combustion by installing NGK B8HS-10 spark plugs gapped precisely to 0.035–0.039 inches (0.9–1.0 mm). Routine lower unit gear lube changes and cooling impeller inspections will protect this reliable 3-cylinder 2-stroke engine for years.
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Notice: Specifications, fuel ratios, and maintenance guidelines listed on VintageMotorSpecs.com are compiled for historical reference and educational purposes only.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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