2025 Mercury 20HP 4-Stroke Tiller Outboard Specifications.

• Horsepower: 20 HP (14.7 kW
• Engine Type: 4-Stroke, Inline-2
• Fuel Delivery: Electronic Fuel Injection (EFI)
• Recommended Fuel: Unleaded 87 octane (up to 10% ethanol)
• Starting: Manual (kick start) or optional electric on some variants
• Displacement: ~333 cc (20.3 cu in)
• Bore × Stroke: 61 mm × 57 mm (2.402″ × 2.244″)
• Full-Throttle RPM Range: ~5,400 – 6,100 rpm
• Ignition: CDI with electronic spark advance
• Induction: SOHC (single overhead cam)

Drive Train & Steering:

• Steering: Tiller handle control
• Gear Shift: Forward-Neutral-Reverse (F-N-R) integrated in tiller
• Gear Ratio: ~2.15 : 1
• Trim & Tilt: Manual trim & tilt (power tilt on some configurations)

Shaft & Weight:

• Shaft Length Options:
  • Short Shaft – 15″ (381 mm)
  • Long Shaft – 20″ (508 mm)
• Dry Weight: ~99 – 103 lb (~45 kg) for standard tiller models

Cooling & Protection:

• Cooling: Water-cooled with thermostat
• Protection Systems: Over-rev protection, low oil pressure warnings, start-in-gear protection, safety lanyard stop switch Propeller:

• Standard Prop: 3-Blade aluminum prop (approx. 9.2″ diameter × 9.1″ pitch)