1980 Evinrude 15 HP Tracker Outboard Specs & Part Numbers
The 1980 Evinrude 15 HP outboard motor (specifically the “Tracker” edition) is a legendary piece of marine engineering. Built during the golden era of Outboard Marine Corporation (OMC), this twin-cylinder, two-stroke motor is highly sought after by anglers, duck hunters, and vintage boat restorers alike. Known for its exceptional power-to-weight ratio, bulletproof reliability, and ease of maintenance, this motor remains a staple on waterways today.
This technical guide provides comprehensive specifications, maintenance protocols, and historical context for owners and mechanics working on this classic outboard.
—
1. Overview & Technical Specifications
The “Tracker” designation was a special-edition branding co-released alongside the rising popularity of Bass Tracker boat packages in the late 1970s and 1980s. Under the cowling, it features the identical, time-tested OMC 15 HP powerhead design utilized from 1974 through the late 1990s.
| Specification | Details |
|---|---|
| Horsepower | 15 HP @ 5500 RPM |
| Engine Type | 2-Cylinder, 2-Stroke, Loop-Charged |
| Displacement | 13.2 cubic inches (216 cc) |
| Bore & Stroke | 2.250″ x 1.656″ (57.15 mm x 42.06 mm) |
| Fuel-to-Oil Ratio | 50:1 (Unleaded gasoline to TC-W3 2-stroke marine oil) |
| Ignition System | CDI (Capacitor Discharge Ignition) – Breakerless |
| Weight | Approx. 74 lbs (33.5 kg) – Short Shaft (15″) model |
| Cooling System | Water-cooled, Thermostatically controlled bypass |
| Starting System | Manual Rope Start (Electric start optional upgrade kit) |
—
2. Common Maintenance & Tune-Up Specs
To keep the 1980 Evinrude 15 HP running at peak performance, regular tune-ups are essential. This motor features a solid-state ignition system, which simplifies maintenance compared to older point-and-condenser models.
Ignition & Spark Plug Specifications
- Recommended Spark Plug: Champion L77JC4 (or QL77JC4 for suppressing radio/sonar interference)
- Spark Plug Gap: 0.030 inches (0.76 mm)
- Spark Plug Torque: 17.5–20.5 lb-ft (24–27 N·m)
- Points/Breaker Gap: N/A (This model features a solid-state CDI system under the flywheel; there are no mechanical ignition points to adjust or gap.)
Fuel System Maintenance
- Carburetor Low-Speed Needle Adjustment: Start by gently turning the low-speed idle mixture screw clockwise until it seats lightly, then back it out 1.5 turns. Adjust with the motor warm and running in gear to achieve a smooth idle.
- Fuel Filter: Inline screen located inside the fuel pump cover. Inspect and clean with carburetor cleaner annually.
Gearcase (Lower Unit) Service
- Gear Lube Type: OMC Hi-Vis Marine Gearcase Lubricant (or high-quality SAE 80W-90 marine gear oil meeting GL-5 specs)
- Gearcase Capacity: Approx. 9.0 fluid ounces (266 ml)
- Drain/Fill Washer: Always replace the nylon washers on both the upper “vent” plug and lower “drain” plug to prevent water intrusion.
Water Pump & Impeller Information
- Replacement Interval: Recommended every 2 years or 100 running hours.
- OEM Impeller Part Number: 395289 (Often sold as part of a complete pump housing rebuild kit, Sierra Part #18-3002).
- Water Pump Housing Warning: If the internal stainless steel cup or outer plastic housing shows signs of scoring or heat distortion, replace the entire water pump assembly, not just the rubber impeller.
—
3. Notable Features & History
The OMC 9.9 / 15 HP Platform Legacy
In 1974, OMC introduced a completely redesigned lightweight 9.9 HP and 15 HP outboard family. Prior to this, small-portable outboards were relatively heavy and featured slow-revving designs. The new platform utilized a compact, high-RPM loop-charged design with cross-flow scavenging. This exact architecture remained in production with minor refinements for three decades, cementing it as one of the most successful outboard designs in marine history.
The “Tracker” Edition Distinction
The “Tracker” graphic scheme was introduced to target the burgeoning recreational fishing market. It typically featured customized dark grey/black graphics matching the aesthetic of the early aluminum Bass Tracker boats sold as complete turn-key packages. Mechanically, the “Tracker” was identical to standard blue-cowled Evinrude 15 HP models of the same year, meaning parts compatibility is 100% identical.
Key Design Features
- Shallow Water Drive: A multi-position tilt mechanism allows the motor to be run at a partially tilted angle for navigating flats, marshes, and rocky shallows.
- Twist-Grip Throttle: Convenient tiller-handle mounted throttle with integrated idle speed adjustment dial, allowing the operator to adjust trolling speed on the fly without reaching back to the carburetor.
- Thermostatic Cooling: Unlike older outboards that ran continuously cold, the 1980 model incorporates a thermostat in the cylinder head. This ensures the motor reaches optimal operating temperature quickly, reducing spark plug fouling during prolonged idling or trolling.
- Carrying Handle: An ergonomically balanced, fold-down carrying handle integrated into the brackets makes this motor highly portable for transom-mounting on small utility boats and tenders.