Makita EB5300TH Repair Manual page 46

2
Next, check that sparks are properly generated while the engine is running. (description below contains only
the differences from 1.
This check is to determine whether engine stall/poor acceleration is caused by spark misfire or some other
problem.
You do not have to do this check, if sparks are properly generated in the startup check described in 1.
* Set Spark gap adjusting knob to 4mm. If the gap is narrower than 4mm, you will not be able to check the
sparks visually, and if you leave the gap unchanged at 6mm, Ignition coil will be overloaded and broken.
Spark plug
(1) Attach Alligator clip onto Spark plug.
(2) Set Spark gap adjusting knob to 4mm.
(3) Start the engine and check that sparks are generated consecutively from idling to the maximum speed.
*Some models have a protection feature that causes misfire when the maximum speed is reached.
And replace Ignition coil with a new one, if spark generation is discontinued for even a moment, or if there is no
spark when the engine speed increases to a certain level.
If spark generation is normal but the engine speed is not abnormal, suspect some parts other than Ignition coil.
* Finish this check in a short period of time, because the cover of Alligator clip can be melted due to the heat of
the engine.
(1)
(2)
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