Section 7
DIAGNOSTIC TESTS
TEST 33 - CHECK SPARK PLUGS
DISCUSSION:
During Test 32, if spark jumped the tester gap, the ignition system must be functioning properly. However, if the engine misses the spark plug itself may be fouled.
PROCEDURE:
Remove spark plugs. Clean with a commercial sol- vent. DO NOT BLAST CLEAN SPARK PLUGS. Replace spark plugs if badly fouled, if ceramic is cracked, or if badly worn or damaged. Set gap to 0.030 inch (0.76mm). Use a Champion RC12YC (or equivalent) replacement spark plug.
Figure 7-35 – Setting Spark Plug Gap
RESULTS:
1.Clean and regap or replace sparks plug as necessary.
2.If spark plugs are good for gasoline models, go to Test 36. For LPG models, go to Test 35.
TEST 34 - CHECK AND ADJUST IGNITION
MAGNETOS
DISCUSSION:
The ignition system used on
The ignition magneto houses a solid
Major components of the ignition system include (a) two ignition magneto assemblies, (b) the spark plugs,
(c)the engine control board and (d) the engine fly- wheel.
If the magneto is defective, the entire assembly must be replaced. The air gap between the magneto and the flywheel magnet is between 0.012” to 0.015”.
The ignition magneto assembly (Figure
Figure 7-36. – Ignition Magneto Assembly
In Test 32, a spark tester was used to check for engine ignition. If sparking or weak spark occurred, one possible cause might be the ignition magneto(s). This test consists of adjusting the air gap between the ignition magneto(s) and the flywheel. The flywheel and flywheel key will also be checked during this test. If no sparking occurs, the ground harness may be at fault.
PROCEDURE:
1.Disconnect the J1 connector from the Engine Control Board. Carefully remove Wire 18A from Pin Location
2.Do the following:
a.Set a VOM to measure resistance. Connect the positive (+) meter test lead to Wire No.18A (Wire 18A still removed from the J1 connector) Connect the negative
b.Set a VOM to the diode test range. Attach the negative
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