Mash Dirt Track 50CC, Руководство пользователя

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Chapter 5
Engine break-in of new motorcycle
The importance of correct new vehicle break-in was mentioned in Foreword.
The correct break-in method is as follows.
It is very important to perform the engine break-in. Any use without engine
break-in will cause serious damage or problems.
A. There is a great difference of performance in terms of power and torque
between a non-break-in engine and a break-in engine.
B. With a well break-in engine: the initial positioning of the parts is well done,
which reduces the damage of the parts during violent movements and extends
the lifetime of the engine.
C. Requirements
1) Never completely open the throttle if the motorcycle has no more than
350km of break-in.
2) When driving, your engine speed should not exceed 80% for each gear ratio
(the throttle must be less than 80%)
Changes of engine speed
Do not drive at a constant engine speed for a long time. For a better break-
in, properly increase and reduce the throttle opening. Change engine speed
from time to time to let various engine parts get "bearing" pressure. When the
pressure is "unloaded", the engine parts will cool down, helping the fitting of
different parts. During break-in period, engine load may be properly increased.
Apply some load to engine parts to guarantee good fitting. This is very
important, but do not apply excessive load to the engine.
Avoid driving at a low speed
Running at a certain low engine speed (with light load) can only polish the
parts but cannot get a good break-in. So long as the upper limit of
recommended throttle opening is not exceeded, drive the vehicle in various
gears with proper acceleration. However, never drive at the maximum
acceleration during the first 1600 km.
Make oil circulating before driving
After starting of warm or cold engine and before applying load or driving,
let the engine run at idle speed for an adequate time. This allows lubricant to
flow to all import engine parts, so as to reduce wearing and increase the service