Yamaha WR250F 2022, Owner'S Service Manual

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STARTING AND BREAK-IN
1-33
WARNING
EWA19030
Since exhaust gas contains harmful ingredi-
ents, do not start or warm it up at an illventi-
lated place or a closed narrow place.
5. To stop the engine, push the engine stop
switch “1”.
TIP
Continue pushing the engine stop switch till the
engine comes to a full stop.
EAM30197
STARTING A WARM ENGINE
Follow the same procedure as for starting a cold
engine with the exception that the starter is not
required when the engine is warm.
TIP
If the engine fail to start, fully open the throttle
grip and push the start switch few seconds to
clear the engine of the rich air-fuel mixture re-
tained in it.
EAM30198
BREAK-IN PROCEDURES
A break-in is important so that rotating portion,
sliding surfaces, and mounted areas may fit one
another, and that the rider may become accus-
tomed to the machine.
NOTICE
ECA25811
Before running, do maintenance on the air
filter element.
1. After warming up the engine, drive it for about
20 minutes at a throttle opening of 1/2 or less.
TIP
This model is equipped with an engine auto-stop
system. The engine stops automatically if left
idling for 7 minutes. If the engine stops, push the
start switch to restart the engine.
2. Make a pit stop, and check mounted areas for
looseness, oil leaks, or other problems.
3. Then, drive it for about 40 minutes at a throt-
tle opening of 3/4 or less.
4. Make a pit stop again, and thoroughly check
mounted areas for looseness, oil leaks, or
other problems. Thorough checks and ad-
justments are required in particular for stretch
of cables, free play of the brake, stretch of the
drive chain, looseness of the spoke, and so
on.
NOTICE
ECA25821
After a break-in or after each race, always
check the points shown in “TORQUE-
CHECK POINTS” for tightening torques and
retighten them.
Also when the following parts are replaced, a
break-in is required.
• Cylinder and Crankshaft: A break-in is re-
quired for about an hour.
• Piston, Piston ring, Valve, Camshaft, and
Gear: A break-in is required for about 30
minutes at a throttle opening of 1/2 or less.
Observe the condition of the engine carefully
during a break-in.
For checkpoints for a break-in, see “MAIN-
TENANCE AFTER BREAK-IN”. If any prob-
lem is found, immediately stop the engine
and make a checkup.
EAM30623
SHIFTING
The shift pedal “1” has adopted a method of 1
down & 5 ups (press-down & kick-ups).
Press it down for N (neutral) to 1st, and kick it up
for 2nd to 6th.
1 1
1