engine YAMAHA WR 250F 2006 User Guide

YAMAHA WR 250F 2006 User Guide WR 250F 2006 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/52334/w960_52334-0.png YAMAHA WR 250F 2006 User Guide

Page 32 of 900

YAMAHA WR 250F 2006 User Guide 1 - 7
GEN
INFOIMPORTANT INFORMATION
EC133000GASKETS, OIL SEALS AND O-
RINGS
1. All gaskets, oil seals, and O-
rings should be replaced when
an engine is overhauled. All gas-
ket surfaces, oil seal lip

Page 52 of 900

YAMAHA WR 250F 2006 User Guide 1 - 27
GEN
INFO
EC150000
CONTROL FUNCTIONS
MAIN SWITCH
Functions of the respective switch
positions are as follows:
ON:
The engine can be started only at
this position.
OFF:
All electrical circuits ar

Page 54 of 900

YAMAHA WR 250F 2006 User Guide 1 - 29
GEN
INFO
EC153000SHIFT PEDAL
The gear ratios of the constant-mesh
5 speed transmission are ideally
spaced. The gears can be shifted by
using the shift pedal 
1 on the left
side of the engine.
K

Page 56 of 900

YAMAHA WR 250F 2006 User Guide 1 - 31
GEN
INFO
FUEL COCK
The fuel cock supplies fuel from the
tank to carburetor and also filters the
fuel. The fuel cock has three posi-
tions:
OFF: With the lever in this position,
fuel will not fl

Page 74 of 900

YAMAHA WR 250F 2006 User Guide 1 - 49
GEN
INFO
FUEL
Always use the recommended fuel
as stated below. Also, be sure to use
new gasoline the day of a race.
CAUTION:
Use only unleaded gasoline. The
use of leaded gasoline will cause
se

Page 76 of 900

YAMAHA WR 250F 2006 User Guide 1 - 51
GEN
INFO
STARTING AND 
BREAK-IN
WARNING
Never start or run the engine in a
closed area. The exhaust fumes
are poisonous; they can cause
loss of consciousness and death
in a very short time. Alw

Page 78 of 900

YAMAHA WR 250F 2006 User Guide 1 - 53
GEN
INFO
1. Inspect the coolant level.
2. Turn the fuel cock to “ON”.
3. Push on the main switch to “ON”.
4. Shift the transmission into neu-
tral.
5. Fully open the cold starter knob
1

Page 80 of 900

YAMAHA WR 250F 2006 User Guide 1 - 55
GEN
INFO
STARTING A WARM ENGINE
Do not operate the cold starter knob
and throttle. Pull the hot starter lever
1 and start the engine by pushing
the start switch or by kicking the kick-
starter

Page 82 of 900

YAMAHA WR 250F 2006 User Guide 1 - 57
GEN
INFO
BREAK-IN PROCEDURES
1. Before starting the engine, fill the
fuel tank with the fuel.
2. Perform the pre-operation
checks on the machine.
3. Start and warm up the engine.
Check the idle

Page 84 of 900

YAMAHA WR 250F 2006 User Guide 1 - 59
GEN
INFO
TORQUE-CHECK POINTS
Frame construction Frame to rear frame
Combined seat and fuel tank Fuel tank to frame
Exhaust system Silencer to rear frame
Engine mounting Frame to engine
Engine b
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