Mercury 8HP 4 Stroke Outboard Motor - F8 Long Shaft

Mercury 8HP 4 Stroke Outboard Motor - F8 Long Shaft

Mercury 8HP 4 Stroke Outboard Motors are a popular, lightweight motors known for easy one-handed multi-function tiller control (shift, throttle, tilt, steering), smooth EFI (Electronic Fuel Injection) for instant starts and efficiency, and quiet operation, featuring a long shaft (508mm), manual start (with electric start option available as F8 ELH), F-N-R gears, and manual trim with shallow water drive, making it great for inflatables and small fishing boats.

Mercury 8HP 4 Stroke Outboard Motor Key Features

• Engine Type: Inline 2-cylinder, 4-stroke engine with a displacement of 208cc.
• Horsepower: 8 HP (5.9 kW).
• Shaft Length: A "long shaft" model has a length of 20 inches (508 mm).
• Weight: The dry weight for the lightest models is approximately 84 lbs (38 kg).
• Starting: Available in both manual start (with a manual recoil even on electric models) and electric start options. Manual start models feature a simplified starting procedure and faster warm-up.
• Fuel System: Features Electronic Fuel Injection (EFI) on newer models for reliable starting in all weather conditions, better idle quality, and improved fuel economy over carburettor engines.
• Steering & Control: Equipped with a multi-function tiller handle that allows for one-handed operation of steering, throttle, shifting (F-N-R gears), and stopping.
• Durability: Built with high-grade marine alloy, stainless steel water pump housing, and zinc-coated water passages, making it rated for saltwater use and protection against corrosion.
• Additional Features:
  • Shallow Water Drive: A system with multiple trim positions for easy operation in shallow areas.
  • Idle Charge: A battery management system on some models that increases idle RPM automatically to help recharge low batteries.
  • Top Cowl Service Door: Provides easy, tool-free access to the dipstick and oil fill for simple oil checks.
  • External Fuel Tank: Comes standard with a 3.2-gallon (12 L) remote fuel tank and fuel line.
  • Low Noise: Features a through-propeller-hub exhaust and vibration-dampening cowl design for a quiet ride.

Mercury 8HP 4 Stroke Outboard Motor FAQs

Is it fuel efficient?
Yes, the EFI technology in newer models provides up to 27% better fuel economy compared to older, carburettor models.

What does "long shaft" mean?
A long shaft outboard is designed for boats with a deeper transom, typically requiring a 20-inch shaft length, measured from the top of the transom to the anti-ventilation plate. A short shaft is typically around 15 inches.

Can I use it in saltwater?
Yes, the engine is built with durable, saltwater-rated materials to resist corrosion. It is recommended to flush the engine with fresh water after every use in saltwater.

Is it easy to start?
The EFI system is designed for consistent, easy starting in all weather conditions. Manual start models also feature an automatic charging system for ignition.

Does it have a built-in fuel tank?
No, it does not have an integrated fuel tank, but it comes standard with an external 3.2-gallon (12 L) remote fuel tank and line.

What maintenance is required?
The primary maintenance interval is every 100 hours of use or once a year, whichever comes first. This includes changing the engine oil and filter, gearcase lubricant, and fuel filters, as well as inspecting spark plugs and anodes.