Yamaha 25D, Owner'S Manual

Page: 26 / 68

Operation
21
EMU27270
Ring Free Fuel Additive
Gasoline is a precise blend of many different
substances, each chosen to give certain
characteristics. Gasoline blends have been
changing in recent years in response to con-
cerns about pollution and resulting emis-
sions regulations. One of the most obvious
changes has been the elimination of lead
from most fuels.
As gasoline has changed, the amount of ad-
ditives such as aromatics and oxygenates
has increased. These additives are impor-
tant for the engines in passenger cars, but
they can have detrimental effects in marine
engines, because of increased deposits in
the combustion chamber. When enough de-
posits collect, piston rings begin sticking.
Performance drops and engine wear in-
creases dramatically.
While many additives available may reduce
deposits, Yamaha recommends the use of
Ring Free Fuel Additive , available from
your Yamaha dealer. Ring Free Fuel Addi-
tive has repeatedly proven its ability to clean
combustion deposits from inside the engine,
notably the critical piston-ring-land area, and
fuel system components. Follow product la-
beling for use instructions.
EMU27403
Gasoline and oil mixing (100:1)
If equipped with a portable fuel tank
1.
Pour oil into the portable fuel tank, and
then add gasoline.
2. Replace the fuel tank cap and close
tightly.
3. Shake the fuel tank to mix the fuel thor-
oughly.
4. Make sure that the oil and gasoline are
mixed.
If equipped with a built-in fuel tank
1.
Pour oil into a clean fuel can, and then
add gasoline.
ZMU03012
Gasoline to engine
oil ratio
Break-in period See page 19
After break-in 100:1
1. Engine oil
2. Gasoline