Yamaha MM700A, Manual

Page: 13 / 282

GENERAL INFORMATION 7
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cates that the viscosity testing was done at low tempera-
ture to simulate cold-weather operation. Engine oils fall
into the 5 to 50 range.
Multigrade oils (for example 5W-20) have been
changed by additives that modify the oil to be less viscous
(thinner) at low temperatures and more viscous (thicker)
at high temperatures. This allows the oil to perform effi-
ciently across a wide range of engine operating condi-
tions. The lower the number, the easier the engine will
start in cold climates. Higher numbers are usually recom-
mended for engines running in hot weather conditions.
Greases
Grease is lubricating oil with thickening agents added
to it. The National Lubricating Grease Institute (NLGI)
grades grease. Grades range from No. 000 to No. 6, with
No.
6 being the thickest. Typical multipurpose grease is
NLGI No.
2.
For specific applications, manufacturers
may recommend water-resistant type grease or one with
an additive such as molybdenum disulfide (MoS2).
Brake
fluid
Brake fluid is the hydraulic fluid used to transmit hy-
draulic pressure (force) to the wheel brakes. Brake fluid is
classified by the Department of Transportation (DOT).
Current designations for brake fluid are DOT
3, DOT 4
and DOT 5. This classification appears on the fluid con-
tainer.
Each type of brake fluid has its own definite character-
istics. Do not intermix different types of brake fluid. DOT
5 fluid is silicone-based. DOT 5 is not compatible with
other fluids or in systems for which it was not designed.
Mixing DOT 5 fluid with other fluids may cause brake
system failure. When adding brake fluid, only use the
fluid recommended by the manufacturer.
Brake fluid will damage any plastic, painted or plated
surface it contacts. Use extreme care when working with
brake fluid and remove any spills immediately with soap
and water.
Hydraulic brake systems require clean and moisture
free brake fluid. Never reuse brake fluid. Keep containers
and reservoirs properly sealed.
WA R N I N G
Never pour a mineral-based (petroleum)
oil
into the brake system. Mineral oil causes
rubber parts in the system to swell and
break apart, resulting
in complete brake
failure.
Cleaners, Degreasers and Solvents
Many chemicals are available to remove oil, grease and
other residue from the vehicle.
Before using cleaning solvents, consider how they will
be used and disposed of, particularly if they are not wa-
ter-soluble. Local ordinances may require special proce-
dures for the disposal of many types of cleaning
chemicals. Refer to Safety and Cleaning Parts in this
chapter for more information on their use.
Use brake parts cleaner to clean brake system compo-
nents when using petroleum-based products will damage
seals. Brake parts cleaner leaves no residue. Use electrical
contact cleaner to clean electrical connections and com-
ponents without leaving any residue. Carburetor cleaner
is a powerful solvent used to remove fuel deposits and
varnish from fad system components. Use this cleaner
carefully, as it may damage finishes.
Generally, degreasers are strong cleaners used to re-
move heavy accumulations of grease from engine and
frame components.