For flush-muff attachments, temporarily
cover the auxiliary water inlets with heavy
tape on their 15- to 30-hp models and high-performance Lightning M2-type gear cases
(remember to remove the tape afterward).
Water pressure should be between 20 and
40 psi. (You can buy a pressure gauge attachment at a hardware store to monitor psi.)
Flush for at least five minutes at an idle
speed, with the engine in a vertical posi-
tion. When using the flushing port, it is not
necessary to run the engine. Keep the engine
vertical after flushing so that all water drains
from the powerhead.
case. The prop must be removed and the
engine run for about five minutes with either
procedure. Either method is acceptable.
Midsize engines ( 25 to 50 hp): Use only
the factory “WASH” port located in the
lower port/left side of the gear case. Again,
the engine must run, with prop removed,
for about five minutes. Honda warns that if
water pressure is low, tape should be used to
close off the engine’s water intakes on each
side of the gear case.
Larger engines ( 60 to 250 hp): Honda’s
only recommended flushing procedure is to
use the factory flushing port connected to
a garden hose with the engine not running.
For a video on how to flush your
outboard, see this article online at
Mercury’s procedure varies by engine size
and series. Smaller and midsize four-stroke
outboards use the flush port at the rear of
the engine. The engine must be warmed up
to open the thermostat and circulate water
throughout the engine’s cooling passages completely. The engine can be vertical or tilted.
Remove the prop, and run in neutral at no
more than an idle speed for at least five minutes. The water supply should not be opened
more than halfway to regulate water pressure.
Optimax two-stroke outboards: Remove
the prop, attach flush muffs so that the rubber cups fit tightly over the water intakes,
then adjust water flow so that some water
leaks out around the cups. Start the engine
and run at idle speed in neutral for three
to five minutes. For flushing without muffs,
Mercury offers a garden-hose adapter that
connects to a port in the lower engine cowl;
this port is accessed by removing a dust
cover. Mercury makes special note of using
this adapter to drain the cooling water from
the engine by disconnecting it from the
water-supply hose, then tilting the engine
to allow all the water to drain out. This is
especially important in freezing climates.
Water pressure no higher than 45 psi should
be used. The engine can be running or not
when flushing, and flushing should be for
at least three minutes. Mercury notes that
this procedure should be used when flushing the engine after use in salty or dirty
LED UNDERWATER FISH AND DOCK LIGHTING SYSTEMS
THIS PRODUCT IS PROTECTED
BY US PATENT 8444283
OTHER U.S & FOREIGN
• Plugs into a standard outlet (no electrician needed!) •
• Costs pennies a day to operate! •