1982 Evinrude 9.9 HP Outboard Specs & Part Numbers
The 1982 Evinrude 9.9 HP is a legendary two-stroke outboard motor built by the Outboard Marine Corporation (OMC). Renowned for its durability, lightweight design, and ease of maintenance, this motor remains a favorite among fishermen, small-boat owners, and collectors today. Whether you are troubleshooting an old runner or performing a seasonal tune-up, this technical guide provides the comprehensive specifications and procedures required to keep this classic outboard performing at its peak.
Overview & Technical Specifications
In 1982, OMC produced the 9.9 HP model in both manual and electric start configurations, with short-shaft (15-inch) and long-shaft (20-inch) variations. The design utilizes a crossflow scavenging system with two intake ports and deflector pistons, delivering a highly reliable power curve.
| 1982 Evinrude 9.9 HP Engine Specifications | |
|---|---|
| Model Designation Code (1982) | CN (e.g., E10RCN, E10ELCN) |
| Horsepower | 9.9 HP @ 5000 RPM (Operating range: 4500–5500 RPM) |
| Cylinder Configuration | 2-Cylinder, Inline 2-Stroke |
| Displacement | 15.0 cubic inches (244 cc) |
| Bore x Stroke | 2.188 in. x 2.000 in. (55.6 mm x 50.8 mm) |
| Fuel/Oil Ratio | 50:1 (Unleaded 87 Octane / TC-W3 Marine Outboard Oil) |
| Cooling System | Water-cooled, Thermostatically Controlled bypass system |
| Weight (Dry, Manual Short Shaft) | Approx. 74 lbs (33.5 kg) |
Common Maintenance & Tune-up Specs
Proper ignition and fuel calibration are vital to keeping the 1982 Evinrude running smoothly. Below are the precise technical tolerances and wear limits required during a routine tune-up.
| Tune-up & Ignition Values | |
|---|---|
| Spark Plug Type | Champion QL77JC4 (or L77JC4) |
| Spark Plug Gap | 0.030 inches (0.76 mm) |
| Spark Plug Torque | 17.5–20.5 lb-ft (24–28 N·m) |
| Ignition System Type | Mag 15 CD (Capacitor Discharge) Electronic Ignition |
| Points / Condenser Gap | N/A (Solid State — No points) |
| Gearcase Oil Capacity | Approx. 9.0 fl. oz. (266 ml) |
| Gearcase Lubricant Type | OMC Hi-Vis Marine Gearcase Lube (or equivalent 80W-90 API GL-5) |
| Propeller Shaft Drive Type | Pin Drive (uses a shear pin and cotter key) |
Water Pump & Impeller Maintenance
The water pump impeller is a critical wear item and should be replaced every 2 to 3 seasons, or sooner if the motor has run dry.
- Impeller Part Number Reference: OEM 395289 (Often sold as a complete housing kit, OEM 394711 / Sierra 18-3327).
- Impeller Installation Tip: When installing the new impeller into the stainless steel cup, rotate the driveshaft clockwise while pressing down on the housing. This ensures the impeller vanes pre-flex in the correct operating direction.
Carburetor Tuning (Idle Adjustment)
The 1982 carburetor features a fixed high-speed main jet (located in the bottom of the float bowl) and an adjustable low-speed idle needle on the front of the intake cowling.
- Gently turn the low-speed idle needle clockwise until it lightly seats. Do not overtighten, or you will damage the needle taper.
- Back the needle out (counter-clockwise) exactly 1-1/2 turns. This is your baseline starting point.
- With the motor warmed up and running in gear in a test tank, turn the needle in (clockwise) 1/8-turn at a time until the engine begins to stumble or spit (lean limit).
- Turn the needle back out (counter-clockwise) slowly until the engine runs smoothly and accelerates without hesitation. The final sweet spot is typically 1/4-turn out from the lean stumble point.
Notable Features & Design History
The OMC 9.9 HP platform was introduced in 1974 alongside its 15 HP sibling, designed to replace the low-slung, “turtleback” 9.5 HP model. By 1982, OMC had ironed out early teething issues, resulting in one of the most mechanically refined outboard designs in marine history.
Key Engineering Strengths of the 1982 Model:
- Interchangeability with the 15 HP: The 1982 9.9 HP shares its block, pistons, stroke, and lower unit with the 15 HP variant. The primary differences lie in the carburetor throat diameter and the exhaust tube tuner. This robust construction means the 9.9 HP is heavily over-engineered for its power rating, leading to exceptional longevity.
- Upper Shifter Lever: Unlike older outboards with low-mounted shifters near the lower unit, the 1982 model features a convenient, top-right front-mounted gear shift, allowing for quick transitions between Forward, Neutral, and Reverse.
- Shallow Water Drive & Tilt: This model incorporates a multi-position tilt lock system with a dedicated semi-tilted “shallow water drive” position, protecting the gearcase and propeller when navigating shoals.
- Pin-Drive Propeller System: The 1982 model retains the classic pin-drive system, using a soft metal shear pin located behind the plastic propeller hub dome. This protects the internal driveshaft and gears from damage if the propeller strikes an underwater obstacle.
With basic seasonal maintenance—including fresh gear oil, clean spark plugs, and a healthy water pump impeller—the 1982 Evinrude 9.9 HP will continue to provide reliable, fuel-efficient service for decades to come.