Monday, July 22, 2024


Model: 90 OPTIMAX


Product Specification Listing

Marine Engine: Mercury 90 HP Optimax

General Information:

  • Model: Mercury 90 HP Optimax
  • Engine Type: Outboard, 2-stroke direct fuel injection (DFI)
  • Horsepower: 90 HP
  • Warranty: Typically 3 years (check with the dealer for specific warranty details)

Dimensions and Weight:

  • Shaft Length: 20 inches (long shaft) or 25 inches (extra-long shaft)
  • Weight: Approximately 375 lbs / 170 kg (may vary depending on configuration)

Performance and Engine:

  • Cylinder Configuration: Inline 3 cylinders
  • Displacement: 1.5 liters / 92 cubic inches
  • Fuel System: OptiMax Direct Fuel Injection (DFI)
  • Full Throttle RPM Range: 5000-5750 RPM
  • Induction System: Loop charge (2-stroke)
  • Rev Limiter: Yes, electronic

Fuel and Oil System:

  • Fuel Type: Unleaded gasoline, minimum 87 octane
  • Fuel Tank Capacity: N/A (external fuel tank assumed)
  • Oil Type: Optimax/DFI oil
  • Oil Injection System: Yes, automatic

Cooling System:

  • Cooling System: Water-cooled with thermostat & pressure-controlled
  • Starting System: Electric start
  • Ignition System: PCM 07 (Digital Inductive)
  • Alternator System: 60-amp / 756-watt (belt driven)

Controls and Steering:

  • Gear Shift: F-N-R (Forward-Neutral-Reverse)
  • Steering Type: Remote (also compatible with power steering)
  • Trim Positions: Power trim and tilt

Exhaust and Emissions:

  • Exhaust System: Through prop exhaust
  • Emissions Compliance: EPA and CARB 3-Star rated (varies by region)


  • Standard Propeller: Aluminum or stainless steel (options available)
  • Gear Ratio: 2.33:1

Accessories and Features:

  • Instrumentation: Typically includes tachometer, speedometer, trim gauge, and fuel gauge (dependent on the model-specific console)
  • SmartCraft Compatibility: Yes, for engine monitoring and diagnostics
  • EPS (Electronic Power Steering): Optional

Additional Features:

  • High-performance DFI system for better fuel efficiency
  • Advanced Sound Control for quieter operation
  • Enhanced corrosion protection for salt-water use
  • Pleasure and light commercial use rated

Safety and Diagnostics:

  • Engine Guardian System: For real-time monitoring and alerts
  • Overheat Protection: Yes
  • Low Oil Warning: Yes


  • Included Accessories: Operator's manual, warranty card, basic toolkit, external fuel tank
  • Optional Accessories: Trolling motor, additional propellers, prop nut kits, fuel line assembly


  • ISO 9001 Certified
  • EPA & CARB Compliant


Always verify details with an authorized Mercury dealer to ensure compatibility with your specific boat and requirements. Specifications might vary slightly based on manufacturing updates or regional variations.

[Product Type: Engine]

Product Specifications

Outboard Outboard
Engine Type 90 HP OPTIMAX
Steering Remote
Lubrication Electronic multipoint oil injection
Fuelinduction 2-stage direct fuel injection
Trim Power trim
Exhaust Through prop
Starter Electric
Ignition PCM 07
Alternator 60-amp/756-watt belt-driven
Gears F N R
Shaftlength 20 or 25/508 or 635(in/mm)
Gear Ratio 2.33:1
Rated Speed 5000 r/min
Displacement 1526 cm3 (1.53L, 93.12in3)
Cylinders Arrangement/Number 3
Cooling Water-cooled with thermostat & pressure-controlled
Weight 170 kg (374.79lbs)
Stroke 76 mm (2.99in)
Bore 92 mm (3.62in)
Power 90 HP (67.10kw)

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