O.S. Engines 21RG-MX - Manual (Page 21)

Symptom Factor Cause Corrective action
TROUBLE SHOOTING WHEN THE ENGINE FAILS TO START
Four key points
For quick, reliable starting, the following four conditions are required.
1 Good compression. 2 Adequate "glow" at glowplug. 3 Correct mixture.
4 Sufficient electric starter rotating speed.
If the engine fails to start, or does not keep running after being started, check symptoms against the
following chart and take necessary corrective action.
Note: The most common causes of trouble are marked with three asterisks, the less common problems
with one or two asterisks.
Recharge the electric starter battery.
Pull the recoil starter briskly.
Recharge lead-acid cell or replace dry battery. (Note: An unused,
or almost unused, dry battery may sometimes be of insufficient
capacity if it is "old stock".)
Replace glowplug. Check that applied voltage is not too high.
Check glowplug heating using other leads.
Close needle-valve fully and remove glowplug, Apply starter to
pump out excess fuel. Re-start engine.
Refer to p.9
Sluggish rotation
Glowplug battery
discharged.
Glowplug element
is burned out
Something wrong
with battery leads.
Engine "flooded"
Insufficient fuel.
Engine fails
to fire.
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3
4
2
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