Operating Engine; Priming Fuel System; Starting Engine - Yamaha F250 Owner's Manual

changing in recent years in response to con-
cerns about pollution and resulting emissions
regulations. One of the most obvious changes
has been the elimination of lead from most fu-
els.
As gasoline has changed, the amount of addi-
tives such as aromatics and oxygenates has
increased. These additives are important for
the engines in passenger cars, but they can
have detrimental effects in marine engines,
because of increased deposits in the combus-
tion chamber. When enough deposits collect,
piston rings begin sticking. Performance
drops and engine wear increases dramatical-
ly.
While many additives available may reduce
deposits, Yamaha recommends the use of
Ring Free Fuel Additive, available from your
Yamaha dealer. Ring Free Fuel Additive
has repeatedly proven its ability to clean com-
bustion deposits from inside the engine, nota-
bly the critical piston-ring-land area, and fuel
system components. Follow product labeling
for use instructions.
EMU27450

Operating engine

EMU31810

Priming fuel system

EWM01530
WARNING
Before starting the engine, make sure
G
that the boat is tightly moored and that
you can steer clear of any obstructions.
Be sure there are no swimmers in the
water near you.
Gasoline is highly flammable, and its va-
G
pors are flammable and explosive. Re-
frain from smoking, and keep away from
open flames and sparks.
This product emits exhaust gases which
G
contain carbon monoxide, a colorless,
odorless gas which could cause brain
damage or death when inhaled. Symp-
toms include nausea, dizziness, and
drowsiness. Keep cockpit and cabin ar-
eas well ventilated. Avoid blocking ex-
haust outlets.
1. If there is a fuel joint or a fuel cock on the
boat, firmly connect the fuel line to the
joint or open the fuel cock.
2. Squeeze the primer pump, with the arrow
pointing up, until you feel it become firm.
1. Arrow
EMU27490

Starting engine

EMU27624
Electric start and remote control models
1. Place the remote control lever in " "
(neutral).
NOTE:
The start-in-gear protection device prevents
the engine from starting except when in neu-
tral.
Operation
N
ZMU04588
37