2016 YAMAHA PW50 engine

Instrument and control functions
4-5
4 gasoline of a different brand or premi-
um unleaded fuel. Use of unleaded fuel
will extend spark plug life and reduce
maintenance cost.
Gasohol
There are two types of gasohol: gaso-
hol containing ethanol and that con-
taining methanol. Gasohol containing
ethanol can be used if ethanol content
does not exceed 10% (E10). Gasohol
containing methanol is not recom-
mended by Yamaha because it can
cause damage to the fuel system or
vehicle performance problems.
For Europe
NOTICE
ECA15591
Use only unlea
ded g asoline. The use
of lea ded g asoline will cause severe
d amag e to internal en gine parts,
such as the piston rin gs as well as to
the exhaust system.
Your Yamaha engine has been de-
signed to use regular unleaded gaso-
line with a research octane number of
95 or higher. If knocking (or pinging)
occurs, use a gasoline of a different
brand or premium unleaded fuel. Use
of unleaded fuel will extend spark plug
life and reduce maintenance costs. For Oceania an
d South Africa
NOTICE
ECA15591
Use only unlea ded g asoline. The use
of lead ed g asoline will cause severe
d amag e to internal en gine parts,
such as the piston rin gs as well as to
the exhaust system.
Your Yamaha engine has been de-
signed to use regular unleaded gaso-
line with a research octane number of
91 or higher. If knocking (or pinging)
occurs, use a gasoline of a different
brand or premium unleaded fuel. Use
of unleaded fuel will extend spark plug
life and reduce maintenance costs.
Recommen ded fuel:
REGULAR UNLEADED GASOLINE
ONLY
Fuel tank capacity:
2.0 L (0.5 US gal, 0.4 Imp.gal)
Recommen ded fuel:
REGULAR UNLEADED GASOLINE
ONLY
Fuel tank capacity:
2.0 L (0.5 US gal, 0.4 Imp.gal)
U2SA82E0.book Page 5 Monday, June 8, 2015 1:09 PM

Instrument and control functions
4-6
4
EAU13414
Fuel tank breather hose
Before operating the motorcycle:
 Check the fuel tank breather hose
connection.
 Check the fuel tank breather hose
for cracks or damage, and replace
it if necessary.
 Make sure that the fuel tank
breather hose is not blocked, and
clean it if necessary.
EAU13454
2-stroke en gine oil
Make sure that there is sufficient 2-
stroke engine oil in the oil tank. Add the
recommended 2-stroke engine oil as
necessary.
NOTICE
ECA16671
Make sure that the 2-stroke en gine
oil tank cap is properly installe d.
1. Fuel tank breather hose
1
1. 2-stroke engine oil tank cap
2. Minimum level mark
Recommen ded oil:
See page 9-1.
Oil quantity: 0.30 L (0.32 US qt, 0.26 Imp.qt)
2 1
U2SA82E0.book Page 6 Monday, June 8, 2015 1:09 PM

Instrument and control functions
4-7
4
EAU40702
Fuel cock
The fuel cock supplies fuel from the
tank to the carburetor while filtering it
also.
The fuel cock has two positions:
S (stop)
With the lever in this position, fuel will
not flow. Always return the lever to this
position when the engine is not run-
ning.
O (on)
With the lever in this position, fuel flows
to the carburetor. Normal riding is done
with the lever in this position.
EAU13591
Starter (choke) lever “ ”
Starting a cold engine requires a richer
air-fuel mixture, which is supplied by
the starter (choke).
Move the lever in direction (a) to turn on
the starter (choke).
Move the lever in direction (b) to turn
off the starter (choke).
1. Arrow mark pointing to “S” (stop)
1. Arrow mark pointing to “O” (on)
1
1
1. Starter (choke) lever “ ”
1
(a)
(b)
U2SA82E0.book Page 7 Monday, June 8, 2015 1:09 PM

Instrument and control functions
4-8
4
EAU13681
Kickstarter
To start the engine, fold out the kick-
starter lever, move it down lightly with
your foot until the gears engage, and
then push it down smoothly but force-
fully.
EAU40921
Seat
To remove the seat
1. Remove the mudguard by remov- ing the bolts and washers.
2. Pull the seat off.
To install the seat 1. Insert the projection on the front of the seat into the seat holder as
shown.
2. Place the seat in the original posi- tion.
3. Install the mudguard by installing the washers and bolts.
1. Kickstarter
1
1. Bolt and washer
2. Mudguard
1. Seat holder
2. Projection
1 2
12
U2SA82E0.book Page 8 Monday, June 8, 2015 1:09 PM

Operation and important rid ing points
6-1
6
EAU15952
Read the Owner’s Manual carefully to
become familiar with all controls. If
there is a control or function you do not
understand, ask your Yamaha dealer.
WARNING
EWA10272
Failure to familiarize yourself with
the controls can lea d to loss of con-
trol, which coul d cause an acci dent
or injury.
EAU4088A
Startin g an d warmin g up a
col d en gine
1. Turn the fuel cock lever to “O”
(on).
2. Set the engine stop switch to “START”.
3. Turn the starter (choke) on and completely close the throttle. (See
page 4-7.)
4. While applying the front or rear brake, start the engine by pushing
the kickstarter lever down.
5. After starting the engine, move the starter (choke) back halfway.
6. When the engine is warm, turn the starter (choke) off and set the en-
gine stop switch to “RUN”.
TIP
The engine is warm when it responds
quickly to the throttle with the starter
(choke) turned off.
NOTICE
ECA11043
For maximum en gine life, never ac-
celerate har d when the en gine is
col d!
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Operation and important ri din g points
6-2
6
EAU16661
Startin g a warm en gine
Follow the same procedure as for
starting a cold engine with the excep-
tion that the starter (choke) is not re-
quired when the engine is warm.
Instead, start the engine with the throt-
tle slightly open.
TIP
If the engine does not start after sever-
al kicks, try again with the throttle 1/4
to 1/2 open.
EAU41004
Startin g off
1. While applying the rear brake le-
ver, push the motorcycle off the
centerstand.
2. Completely close the throttle.
3. Set the engine stop switch to “RUN”.
4. Check for oncoming off-road vehi- cles, release the rear brake lever,
and then slowly turn the throttle
grip in order to take off.
U2SA82E0.book Page 2 Monday, June 8, 2015 1:09 PM

Operation and important ri din g points
6-4
6
EAU42031
En gine break-in
There is never a more important period
in the life of your engine than the first 5
hours of riding. It is also important to
accustom the rider to the motorcycle
during this time. Please read the fol-
lowing information carefully.
Since the engine is brand new, do not
put an excessive load on it for the first
5 hours of operation. The various parts
in the engine wear and polish them-
selves to the correct operating clear-
ances. During this period, prolonged
full-throttle operation or any condition
that might result in engine overheating
must be avoided. However, momen-
tary full-throttle operation under load
(i.e., two to three seconds maximum)
does not harm the engine. Each full-
throttle acceleration should be fol-
lowed with a substantial rest period for
the engine. To allow the engine to cool
down from the temporary buildup of
heat, cruise at a lower engine speed.
After the first 5 hours of operation,
thoroughly check the motorcycle for
loose parts, oil leakage and any other
problems. Be sure to inspect and make
adjustments thoroughly, especially ca-
bles. In addition, check all fittings and
fasteners for looseness, and tighten if
necessary.
NOTICE
ECA10271
If any en gine trou ble shoul d occur
d uring the en gine break-in perio d,
imme diately have a Yamaha d ealer
check the vehicle.
EAU40723
Parkin g
When parking, stop the engine, and
then turn the fuel cock lever to “S”
(stop).
WARNING
EWA10312
Since the en gine an d exhaust
system can become very hot,
park in a place where ped estri-
ans or chil dren are not likely to
touch them and b e burne d.
 Do not park on a slope or on soft
groun d, otherwise the vehicle
may overturn, increasin g the
risk of a fuel leak an d fire.
 Do not park near grass or other
flammab le materials which
mi ght catch fire.
U2SA82E0.book Page 4 Monday, June 8, 2015 1:09 PM

Periodic maintenance an d a djustment
7-2
7
EAU17303
Emission controls not only function to
ensure cleaner air, but are also vital to
proper engine operation and maximum
performance. In the following periodic
maintenance charts, the services relat-
ed to emissions control are grouped
separately. These services require
specialized data, knowledge, and
equipment. Maintenance, replace-
ment, or repair of the emission control
devices and systems may be per-
formed by any repair establishment or
individual that is certified (if applicable).
Yamaha dealers are trained and equipped to perform these particular
services.
EAU17312
Owner’s tool kit
The service information included in this
manual and the tools provided in the
owner’s tool kit are intended to assist
you in the performance of preventive
maintenance and minor repairs. How-
ever, additional tools such as a torque
wrench may be necessary to perform
certain maintenance work correctly.
TIP
If you do not have the tools or experi-
ence required for a particular job, have
a Yamaha dealer perform it for you.
U2SA82E0.book Page 2 Monday, June 8, 2015 1:09 PM