Onan MJA Series Service Manual page 16

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TROUBLE-SHOOTING CHART 1, THE ENGINE (Cant.)
POSSIBLE CAUSE TROUBLE
I .
ILowengme
Ipower (Cant.)
I
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Poor fuel.
Poor compression.
Defective ignition (engine
not firing on all cylinders).
Incorrect
timing.
REMEDY
Change fuel, Sect.3. 2. 1.
Check compression,
Sect 3. 7 . 2 and Trouble-
Shooting Chart 8.
See Trouble-Shooting
Chart 4.
See Trouble -Shooting
Chart 4.
Engine misses
at light load
See Sect 3.2.4.
Improper choke operation.
Clean cylinders, See
Heavy carbon deposits in
Sect 3.2.1.
cylinders.
See Trouble-Shooting
Chart 3..
Faulty carburetion.
Spar k plug gaps too
narrOW.
Set at .025.
Intake air leak.
Inspect intake manifold
and carburetor.
Faulty ignition system.
See Trouble-Shooting
Chart 4.
Uneven
I.CU.1.1JjJl
;sinn.
See Sect 3.7.2.
Spark plugs defective.
See Sect 3. 3. 5.
Clogged carburetor idle
jet.
Clean carburetor.
Defective high tension
cable.
Inspect and replace if
necessary.
Engine misfires
at heavy load
Spark plug gap too wide.
Clogged carburetor.
Adjust to .025.
.
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Clean carburetor,
3.~.
5.
sect
Clogged fuel screen.
Clean, Sect 3.2.2.