Running in

RUNNING-IN OF MOTORCYCLE

The CJ750 design and manufacturing process has remained basically unchanged since 1938. This means that assembly and mating surfaces of running components are not to the fine tolerances which are common in modern vehicles today. To ensure that all parts “bed” in with optimum running clearances it is necessary to carefully run in the motorcycle so that all moving parts wear in to the optimum clearances. This process of high friction “lapping in” of parts generates both extra heat and minute metal particles, and requires that care be taken during the initial phases of motorcycle operation to ensure acceptable component life and overall performance.

In order to limit the maximum speed of the motorcycle in running-in period, the caps of the two carburetors are provided with throttle limiter screws (see FIG 2 below) -

The lifted height of throttle valve is limited by the throttle stop screw. At each end of running-in period, the stop screw should be cut off at the relevant slotted position, (as shown in Fig.2). Please note that although these stops assist in controlling the load on the engine, care must still be taken to limit engine speeds during the running-in period.

Sustained long distance driving is not recommended within 0 to 500 km running-in period. To avoid engine temperature rising. It is recommended that the motorcycle be rested every hour for approximately 15 mins. Keep an eye on the temperature of the engine, gearbox, rear drive and brake drums. During the 15 minute break it is recommended that a quick check be carried out on all parts and components for fluid leaks and tightness of components.

For running in and subsequent use it is recommended that a zinc rich oil be used. (1200-1800 ppm). After running in is completed  a full synethetic oil can be used if desired. Check the oils before each days riding and  also at least every time you re-fuel during the running-in period). It is not unusual for small metal particles to be found in the oil during running in. The oil in engine, gearbox and final drive should be replaced at 500Km, 2000Km and 3000km. Normal oil top up and replacement should be carried out by referring to the motorcycle lubrication table.

Use the table below as a guideline to road speeds in each gear during the running in period

Distance

1st

2nd

3rd

4th

0-500

20

35

50

70

500-2000

25

45

65

80

2000-3000

25

50

70

90

Running in is considered complete when the motorcycle has completed 3000 km of running.


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