Mercury 9.9 hp 2/stroke Short in Wongan-Ballidu, Western Australia
Mercury 9.9HP 2‑Stroke – Full Technical Details
Engine Specifications
Engine type: 2‑stroke, 2‑cylinder gasoline outboard
Displacement: 169–170cc class (varies by model year)
Power output: 9.9 HP (7.4 kW) @ 5000–6000 rpm
Induction system: Cross‑flow scavenging with fixed‑jet WMC carburetor
Ignition: CDI (Capacitor Discharge Ignition) for reliable starts
Cooling: Water‑cooled with thermostat
Shaft Length & Model
Short shaft = 15" (381 mm)
Ideal for:
Inflatable boats
Tinnies
Small tenders
Jon boats
Weight
Approx. 26–30 kg depending on model year (noted as lightest in its class)
Extremely portable — easy to lift, mount, and store.
Performance Characteristics
Fast acceleration thanks to 2‑stroke torque curve
High power‑to‑weight ratio (better than most 4‑strokes in this class)
Loop‑charged combustion improves fuel economy and throttle response
Through‑prop exhaust reduces noise for quieter operation
Fuel & Oil
Fuel: Unleaded petrol
Oil: 2‑stroke outboard oil (pre‑mix)
Typical mix: 50:1 (check your exact model manual)
