Engine Break-In - Yamaha TT-R Owner's Manual

OPERATION AND IMPORTANT RIDING POINTS

Engine break-in

There is never a more important peri-
od in the life of your engine than the
first 20 hours of riding. For this rea-
son, you should read the following
material carefully.
Since the engine is brand new, do
not put an excessive load on it for the
first 20 hours of operation. The vari-
ous parts in the engine wear and pol-
ish themselves to the correct operat-
5
ing clearances. During this period,
prolonged full-throttle operation or
any condition that might result in
engine overheating must be avoided.
However, momentary
operation under load (i.e., two to
three seconds maximum) does not
harm the engine. Each full-throttle
acceleration should be followed 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.
EAU00437
0–10 hours
8 Avoid prolonged operation above
1/2 throttle.
8 After every hour of operation,
stop the engine, and then let it
cool for five to ten minutes.
8 Vary the engine speed from time
to time. Do not operate the
engine at one set throttle posi-
tion.
10–20 hours
8 Avoid prolonged operation above
3/4 throttle.
8 Rev the engine freely through
the gears, but do not use full
full-throttle
throttle at any time.
After break-in
Avoid prolonged full-throttle opera-
tion. Vary the engine speed occa-
sionally.
cC
If any engine trouble should occur
during the engine break-in period,
immediately have a Yamaha dealer
check the vehicle.
5-4
EC000049