An enginethathasbeencompletelyoverhauled by beingfittedwithanewpiston,rings,valvesand connecting rod should be throughly RUN- IN before being put back into service. Goodbearingsurfacesandrunningclearancesbetweenthevariouspartscanonlybeestablishedby operating the engine under reduced speed and loads fora short period of time.
While the engineis being tested, checkfor oil leaks.
Make final carburetor adjustment and regulate the engine operating speed.
StepsLoad
Step 1 |
| No load |
|
| ||
Step 2 |
| No load |
|
| ||
Step 3 |
| No load |
| 1 | ||
Step | 4 | 1 | 1.OKW | 1.4HP | ||
1.5 KW b.OHPI | ||||||
|
| 2.4KW | 3.2HP | |||
Step 5 | 1 | :A | f:: | 1 | ||
|
| 4.7KW$ |
| |||
|
| 6.4HP | ||||
Engine speed | Time |
2500 rpm | 10 min |
3000 rpm | 10 min |
3600 rpm | 10 min |
3600 rpm | 30 min |
3600 rpm | 60 min |
6. IGNITION SYSTEM
AS optional parts, these ignition system may be implemented with lamp.coi1, charge coil and excitor coil.
To ensure the easy startability of the engine, the step advancing ignition timing system is incorporated in
theignitioncoil.Thissystemenablestheengineto havebasicallytwodifferentignitiontimings according to the engine speed. Following are the explanation how the system works.
1)At lower speedof the engine
Rotation of theflywheelinducescurrent I,, asthiscurrentflowsthroughthebaseterminal of the power transister, it is activated and the current IZ starts flowing.
As the engine reaches the ignition timing, the ignition timing control circuit for the lower engine speed is activated and lets the currentL flow through the base terminalof the power transistor.
This generates the collector currentL which will bypass the current 11and abruptly shut off the current IZ because the power transistor is turned off.
Thissuddencurrentchangegeneratesabigvoltage on thesecondaryside of theignition coil and which sparks the spark plug.
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