#Model-90elpt|Type-Standard
Whether your day calls for a vacation or a voyage, a Mercury 75 to 150hp FourStroke outboard is the perfect accessory for your next adventure. They feature efficient, lightweight designs that ensure no power goes wasted – the ideal way to get wherever you want to explore next.
Mercury 90HP at a glance: a 2.1L EFI four-stroke with 35-amp charging, available in 20"/25" shafts and Standard or Command Thrust (CT) gearcases. Pick CT for heavier hulls/larger props and better low-speed planing; choose Standard for lighter rigs and max efficiency. SmartCraft-ready, remote helm or advanced tiller – built for quiet, smooth torque and easy servicing.
Choose your configuration:
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Drive: Standard • Command Thrust (CT) for bigger props & lift on heavier boats
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Shaft: 20" (L) or 25" (XL) – measure transom height to confirm
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Controls: Remote helm or advanced tiller (90–115 hp compatible)
90HP Standard vs Command Thrust
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CT = lift & grip: Deeper gearcase + larger-diameter props = easier hole shot, holds plane at lower speeds, better control in chop.
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Top end: Properly propped, CT typically keeps similar top speed on most heavy/utility hulls.
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Pick CT if: Pontoon, loaded multispecies tin, small CC/work skiff, frequent towing.
Spec callouts
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Engine: Inline-4 2.1L EFI • SmartCraft: Yes
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Charging: 35-amp alternator w/ water-cooled regulator
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Weights (lightest): 359 lb (Std) • 363 lb (CT)
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Rotation: RH • Trim/Tilt: PTT
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Fuel: Unleaded 87 (R+M/2) / 90 RON max E10
What to buy with a 90
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Prop: Size to hit recommended WOT RPM with normal crew/gear (CT usually runs larger diameter/lower pitch).
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Rigging: Remote control or advanced tiller, harnesses, ignition/key, steering.
- Service basics: Marine oil (10W-30/25W-40), OEM oil filter, gear lube + crush washers, fuel/water separator.
High-Output Alternator
A powerful alternator – 60 amps on the 150hp outboard and 35 amps on 75 to 115hp outboards – helps keep batteries charged and your onboard electronics running all day.
Command Thrust Gearcase
Available for the 90 and 115hp outboards, the Command Thrust gearcase is designed to turn larger props. It helps get heavy boats on plane more easily and hold them there at lower speeds without impacting top speed.
Electronic Fuel Injection (EFI)
From the moment you crank the engine to the moment you drop the throttle, EFI technology responds with instant power. Surefire starting in all weather conditions. Smooth, efficient acceleration. Maximum capability.
Tiller Handle
With a range of adjustments and ergonomic controls, the available advanced tiller for 90 to 115hp models or Big Tiller for the 150hp engine puts you in complete command of your adventures.
Smooth & Quiet
Optimized from the cowl to the mounts to minimize noise and vibration, Mercury FourStroke outboards are exceptionally quiet and smooth. The 75 to 115hp engines are quieter and smoother than any competing outboards on the water.
Powerful Torque
High-displacement powerheads and lightweight designs combine to deliver instant acceleration and exceptional overall performance.
Comfort
With a balanced powerhead and sophisticated, vibration-dampening cowl design, Mercury FourStroke outboards deliver an exceptionally smooth and quiet ride at any speed.
Durability
Premium corrosion-preventive technologies and durable components ensure FourStroke outboards can stand up to the most demanding marine environments.
Compact Design
Ideal for new engine setups or repowers, the slender width of a Mercury FourStroke outboard fits most transoms, including those with narrow engine wells and tight motor spacing.
Efficiency
Explore farther and stay out longer thanks to impressive power-to-weight ratios, intelligent fuel systems and optimized fuel injection (on most models) that maximize performance from every drop of fuel.
| Horsepower |
90 |
| Alternator Amp/Watt |
35 amp / 441 watt with water-cooled voltage regulator |
| Color |
Black |
| Smartcraft Compatible |
Yes |
| Displacement (L) |
2.1 |
| Dry Weight (Lightest Model) |
359 lbs / 163 kg; 363 lbs / 165 kg (CT model) |
| Engine Type |
Inline 4 |
| HP / KW |
90 / 67 |
| Recommended Fuel |
Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum |
| Prop Rotation |
RH |
| Shaft Length |
20 |
| Control |
RM |
| Trim and Tilt |
PTT |
Need help choosing your engine? Check out our Mercury engine guide.
#Model-90exlpt|Type-Standard
Whether your day calls for a vacation or a voyage, a Mercury 75 to 150hp FourStroke outboard is the perfect accessory for your next adventure. They feature efficient, lightweight designs that ensure no power goes wasted – the ideal way to get wherever you want to explore next.
High-Output Alternator
A powerful alternator – 60 amps on the 150hp outboard and 35 amps on 75 to 115hp outboards – helps keep batteries charged and your onboard electronics running all day.
Command Thrust Gearcase
Available for the 90 and 115hp outboards, the Command Thrust gearcase is designed to turn larger props. It helps get heavy boats on plane more easily and hold them there at lower speeds without impacting top speed.
Electronic Fuel Injection (EFI)
From the moment you crank the engine to the moment you drop the throttle, EFI technology responds with instant power. Surefire starting in all weather conditions. Smooth, efficient acceleration. Maximum capability.
Tiller Handle
With a range of adjustments and ergonomic controls, the available advanced tiller for 90 to 115hp models or Big Tiller for the 150hp engine puts you in complete command of your adventures.
Smooth & Quiet
Optimized from the cowl to the mounts to minimize noise and vibration, Mercury FourStroke outboards are exceptionally quiet and smooth. The 75 to 115hp engines are quieter and smoother than any competing outboards on the water.
Powerful Torque
High-displacement powerheads and lightweight designs combine to deliver instant acceleration and exceptional overall performance.
Comfort
With a balanced powerhead and sophisticated, vibration-dampening cowl design, Mercury FourStroke outboards deliver an exceptionally smooth and quiet ride at any speed.
Durability
Premium corrosion-preventive technologies and durable components ensure FourStroke outboards can stand up to the most demanding marine environments.
Compact Design
Ideal for new engine setups or repowers, the slender width of a Mercury FourStroke outboard fits most transoms, including those with narrow engine wells and tight motor spacing.
Efficiency
Explore farther and stay out longer thanks to impressive power-to-weight ratios, intelligent fuel systems and optimized fuel injection (on most models) that maximize performance from every drop of fuel.
| Horsepower |
90 |
| Alternator Amp/Watt |
35 amp / 441 watt with water-cooled voltage regulator |
| Color |
Black |
| Smartcraft Compatible |
Yes |
| Displacement (L) |
2.1 |
| Dry Weight (Lightest Model) |
359 lbs / 163 kg; 363 lbs / 165 kg (CT model) |
| Engine Type |
Inline 4 |
| HP / KW |
90 / 67 |
| Recommended Fuel |
Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum |
| Prop Rotation |
RH |
| Shaft Length |
25 |
| Control |
RM |
| Trim and Tilt |
PTT |
Need help choosing your engine? Check out our Mercury engine guide.
#Model-90elpt|Type-CommandThrust
Whether your day calls for a vacation or a voyage, a Mercury 75 to 150hp FourStroke outboard is the perfect accessory for your next adventure. They feature efficient, lightweight designs that ensure no power goes wasted – the ideal way to get wherever you want to explore next.
High-Output Alternator
A powerful alternator – 60 amps on the 150hp outboard and 35 amps on 75 to 115hp outboards – helps keep batteries charged and your onboard electronics running all day.
Command Thrust Gearcase
Available for the 90 and 115hp outboards, the Command Thrust gearcase is designed to turn larger props. It helps get heavy boats on plane more easily and hold them there at lower speeds without impacting top speed.
Electronic Fuel Injection (EFI)
From the moment you crank the engine to the moment you drop the throttle, EFI technology responds with instant power. Surefire starting in all weather conditions. Smooth, efficient acceleration. Maximum capability.
Tiller Handle
With a range of adjustments and ergonomic controls, the available advanced tiller for 90 to 115hp models or Big Tiller for the 150hp engine puts you in complete command of your adventures.
Smooth & Quiet
Optimized from the cowl to the mounts to minimize noise and vibration, Mercury FourStroke outboards are exceptionally quiet and smooth. The 75 to 115hp engines are quieter and smoother than any competing outboards on the water.
Powerful Torque
High-displacement powerheads and lightweight designs combine to deliver instant acceleration and exceptional overall performance.
Comfort
With a balanced powerhead and sophisticated, vibration-dampening cowl design, Mercury FourStroke outboards deliver an exceptionally smooth and quiet ride at any speed.
Durability
Premium corrosion-preventive technologies and durable components ensure FourStroke outboards can stand up to the most demanding marine environments.
Compact Design
Ideal for new engine setups or repowers, the slender width of a Mercury FourStroke outboard fits most transoms, including those with narrow engine wells and tight motor spacing.
Efficiency
Explore farther and stay out longer thanks to impressive power-to-weight ratios, intelligent fuel systems and optimized fuel injection (on most models) that maximize performance from every drop of fuel.
| Horsepower |
90 |
| Alternator Amp/Watt |
35 amp / 441 watt with water-cooled voltage regulator |
| Color |
Black |
| Smartcraft Compatible |
Yes |
| Displacement (L) |
2.1 |
| Dry Weight (Lightest Model) |
359 lbs / 163 kg; 363 lbs / 165 kg (CT model) |
| Engine Type |
Inline 4 |
| HP / KW |
90 / 67 |
| Recommended Fuel |
Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum |
| Prop Rotation |
RH |
| Shaft Length |
20 |
| Control |
RM |
| Trim and Tilt |
PTT |
Need help choosing your engine? Check out our Mercury engine guide.
#Model-90exlpt|Type-CommandThrust
Whether your day calls for a vacation or a voyage, a Mercury 75 to 150hp FourStroke outboard is the perfect accessory for your next adventure. They feature efficient, lightweight designs that ensure no power goes wasted – the ideal way to get wherever you want to explore next.
High-Output Alternator
A powerful alternator – 60 amps on the 150hp outboard and 35 amps on 75 to 115hp outboards – helps keep batteries charged and your onboard electronics running all day.
Command Thrust Gearcase
Available for the 90 and 115hp outboards, the Command Thrust gearcase is designed to turn larger props. It helps get heavy boats on plane more easily and hold them there at lower speeds without impacting top speed.
Electronic Fuel Injection (EFI)
From the moment you crank the engine to the moment you drop the throttle, EFI technology responds with instant power. Surefire starting in all weather conditions. Smooth, efficient acceleration. Maximum capability.
Tiller Handle
With a range of adjustments and ergonomic controls, the available advanced tiller for 90 to 115hp models or Big Tiller for the 150hp engine puts you in complete command of your adventures.
Smooth & Quiet
Optimized from the cowl to the mounts to minimize noise and vibration, Mercury FourStroke outboards are exceptionally quiet and smooth. The 75 to 115hp engines are quieter and smoother than any competing outboards on the water.
Powerful Torque
High-displacement powerheads and lightweight designs combine to deliver instant acceleration and exceptional overall performance.
Comfort
With a balanced powerhead and sophisticated, vibration-dampening cowl design, Mercury FourStroke outboards deliver an exceptionally smooth and quiet ride at any speed.
Durability
Premium corrosion-preventive technologies and durable components ensure FourStroke outboards can stand up to the most demanding marine environments.
Compact Design
Ideal for new engine setups or repowers, the slender width of a Mercury FourStroke outboard fits most transoms, including those with narrow engine wells and tight motor spacing.
Efficiency
Explore farther and stay out longer thanks to impressive power-to-weight ratios, intelligent fuel systems and optimized fuel injection (on most models) that maximize performance from every drop of fuel.
| Horsepower |
90 |
| Alternator Amp/Watt |
35 amp / 441 watt with water-cooled voltage regulator |
| Color |
Black |
| Smartcraft Compatible |
Yes |
| Displacement (L) |
2.1 |
| Dry Weight (Lightest Model) |
359 lbs / 163 kg; 363 lbs / 165 kg (CT model) |
| Engine Type |
Inline 4 |
| HP / KW |
90 / 67 |
| Recommended Fuel |
Unleaded Regular 87 Octane Minimum (R+M/2) or 90 RON 10% Ethanol Maximum |
| Prop Rotation |
RH |
| Shaft Length |
25 |
| Control |
RM |
| Trim and Tilt |
PTT |
FAQs
Is the Mercury 90HP SmartCraft compatible?
Yes – engine data ready with compatible SmartCraft gauges/displays.
When should I choose Command Thrust on a 90?
If your boat is heavy/loaded, needs bigger props, or you want lower-speed planing and extra control, choose CT.
What shaft lengths are available for the 90?
20" (L) and 25" (XL). Measure your transom to confirm fit.
Can I order a tiller version?
Yes – the advanced tiller fits 90–115 hp models and can be set up left- or right-hand.
How much alternator output does the 90 have?
35 amps with a water-cooled regulator for stable charging and electronics.
Need help choosing your engine? Check out our Mercury engine guide.
