Mercury FourStroke 6 EFI

• 2 cyl
• 209.8 cm³
• 6 hp
• Petrol

Save my engine

Troubleshooting

Starting problems

• Boat engine won't start after the winter
• Boat engine won't start when warm

Runs rough, stalls or loses power

• Boat engine dies at idle or when shifted into gear
• Boat engine hesitates or dies on acceleration
• Boat engine stops after a while

Smoke and exhaust

• Boat engine smokes blue and burns oil
• White smoke from the boat engine exhaust

Oil, water and fuel

• Petrol smell in the boat: fuel leaking from the engine
• Water in the fuel or tank of the boat engine
• Water in the engine oil: the oil is grey or milky

Electrics, alarms and fault codes

• The battery isn't charging and the charge warning light is on
• The alarm is sounding: what do the warning lights mean?
• Oil pressure alarm on the boat engine: low oil pressure

Drive, gearbox and trim

• Trim not working: the drive won't go up or down
• Gear will not engage or jumps out

Outboard

• The outboard only runs on choke or dies at idle
• Outboard not cooling: no tell-tale stream
• The outboard won't start
• The outboard loses power or won't reach full revs
• Water in the outboard's gearcase oil

Manuals

• Official

  Operation, maintenance and installation manual ↗ (external link)
  EN · PDF · 2026

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Related models

Mercury FourStroke 2.5 / 3.5

Outboard

1 cyl · 85.5 cm³ · 2.5–3.5 hp · Petrol

→

Mercury FourStroke 4 / 5 / 6

Outboard

1 cyl · 123 cm³ · 4–6 hp · Petrol

→

Mercury FourStroke 8 / 9.9

Outboard

2 cyl · 209.8 cm³ · 8–9.9 hp · Petrol

→

Mercury FourStroke 15 / 20

Outboard

15–20 hp · Petrol

→

Service guides

Replacing the impeller →Winterize a boat engine →

Frequently asked questions about Mercury FourStroke 6 EFI

Where can I find the owner's manual for Mercury FourStroke 6 EFI?

Links to owner's manuals and workshop manuals are available under Manuals.

How many cylinders does Mercury FourStroke 6 EFI have?

Mercury FourStroke 6 EFI has 2 cylinders.

What fuel does the Mercury FourStroke 6 EFI use?

Mercury FourStroke 6 EFI runs on petrol.

Sources

• Mercury Marine: 6 HP EFI owner's manual (PDF) ↗ (external link)
• Mercury Marine: Owner's Manual (search by serial number) ↗ (external link)
• Wikipedia: Mercury Marine (en) ↗ (external link)