The weight of the new 25hp EFI is just 71 kg, which is 10kg less than the previous 25hp BigFoot. Weight of the new 30hp EFI is 78kg: that's 28kg lighter than the 30hp version replaced. Light weight has not compromised performance or stability.

The 526cc powerheads have been designed for maximum acceleration and top speed.

They also have the marine industry's lowest noise vibration harshness measurements, aided by a sound-reducing tuned-cowl induction system.

Both the manual and electric start Mercury and Mariner models are electronically fuel injected. These are the first battery-free manual start EFI four-strokes in the industry and it is the first time that there has been a 25hp EFI outboard.

Combined with standard decompression, there is fast, easy starting and smooth running. Other features include thermostatic controlled water cooling, single overhead cam fuel induction, CDI ignition with electric spark advance, overrevving protection, wet sump lubrication and through-prop exhaust.

The new models are available in 15" (381mm) and 20" (508mm) shaft lengths, remote control or tiller, and manual, gas-assist or power trim and tilt.

Tiller versions feature Mercury Marine's exclusive shift-inhandle assembly.

Moving up to the new 80hp and 100hp four cylinder engines, both displace 1,596cc.

They include water cooling, CDI ignition, electric starting, fourvalve dual overhead cam induction, remote steering with optional tiller kit availability, 20amp alternator, power trim, overheating warning system, pressurised wet sump lubrication and through-prop exhaust. Dry weight is 175kg.

Shaft length is 20" (508mm).

All Mercury and Mariner fourstrokes from 25hp up are now electronically fuel injected. The EFI system features single throttle body, multi-point fuel injection. This system uses a single mechanical fuel pump that lifts petrol to the engine vapour separator. It then provides a steady supply of pressurised fuel for the fuel rail.

Ease of starting is the biggest single advantage of EFI, usually requiring only a single turn of the key and no choke, regardless of environmental conditions. A further benefit is smooth throttle response, without the lagging associated with carburetted outboards.

EFI engines are more responsive throughout the rpm operating range. Fuel metering by the on-board microprocessor distributes precisely the optimum amount of fuel at any time, maintaining a high degree of efficiency and reducing fuel costs.

These new four-strokes from Mercury and Mariner meet all European emissions requirements. Our picture shows Mercury's 80 EFI four-stroke.

Marine Power Europe Inc W: marinepower.com