Yamaha TZ250M1 Owner's Service Manual page 34

STARTING AND BREAK-IN
C C CAUTION:
After the break-in or before each race, you
must check the entire machine for loose fit-
tings and fasteners as per "TORQUE-
CHECK POINTS".
Tighten all such fasteners as required.
8. Increase the engine speed up to 10,000
r/min and run about 10 km (6 miles).
9. Increase the engine speed up to 11,000
r/min and run about 10 km (6 miles).
10.Increase the engine speed up to 12,000
r/min and run about 10 km (6 miles). Then
do the plug chop. Check the piston head for
burning to see if there is any problem. Refer
to "SETTING" section in the CHAPTER 7.
11. Run about 10 km (6 miles) in a usual man-
ner. Then do the plug chop. Check the pis-
ton head for burning to see if there is any
problem.
EC195001
BREAKING IN AFTER REPLACEMENT
After a part is replaced with a new one, it is
necessary to break it in as in a new machine.
This is required especially when the following
engine-related parts are replaced.
•Cylinder
•Crankshaft
•Shift fork
$ For warming up and inspection during
break-in,
CHECK LIST" and if there is any problem,
stop the engine immediately and check.
1-19
GEN
INFO
•Piston •Piston ring
•Clutch •Transmission gear
refer to "PRE-OPERATION