Mercury 25 Jet 4-Stroke User Manual

ENGINE INSTALLATION
101
TOP COWL INSTALLATION
1. Engage the front hook and push the top cowl onto the lower
cowl.
2. Push the cowl latch down to lock the cowl in place.
Lifting Outboard
Use the lifting eye located aft of the flywheel to support the engine
when installing the outboard.
10111
Determining the Mounting Height of the Outboard
The following outboard mounting height settings will work good for
most applications, however, because of different boat/hull designs,
the setting should be rechecked by test running the boat. Refer to
Water Testing.
• Installing the outboard too high on the transom will allow the
water intake to suck in air and cause cavitation. (cavitation will
cause the engine to overspeed in spurts and reduce thrust).
This condition should be avoided by proper height setting.
• Installing the outboard too low on the transom will allow
excessive drag.

Mercury 25 Jet 4-Stroke Specifications

General

Horsepower	25 HP
Engine Type	4-Stroke
Full Throttle RPM Range	5000-6000 RPM
Fuel Induction System	Electronic Fuel Injection (EFI)
Shaft Length	15" / 20"
Gear Ratio	2.08:1
Recommended Fuel	87 octane / up to 10% ethanol
Starting	Electric
Weight	71 kg / 157 lbs (Lightest Model Available)
Steering	Tiller
WOT RPM	5000-6000 RPM