ELECTRICAL
Page L-5
Repair and Service Manual
Read all of Section B and this section before attempting any procedure. Pay particular attention to all Notices, Cautions, Warnings and Dangers.
cylinder, etc.). Turn over the engine with the starter.
Look for a blue electrical arc at the spark plug elec-
trode.
3. If there is either a weak arc or no arc, try a new spark
plug, then check the condition and the tightness of the
spark plug wire. Plug wires can be checked by substi-
tuting them with good ones.
4. Replace the plug if necessary. Gap the spark plug
.028" - .030" (.71 - .76 mm) using a wire type spark
plug gauge.
Testing the Magneto
Set the meter to the ohms scale and measure the resis-
tance as shown in the following illustrations.
Fig. 4 Resistance Between A - B and A - C
A normal reading with the negative lead on A and the
positive lead on B would be: 2 - 18 K
Ω.
A normal reading with the negative lead on A and the
positive lead on C would be 2 - 18 K
Ω
.
A normal reading with the negative lead on B and the
positive lead on A would be
∞
.
A normal reading with the negative lead on B and the
positive lead on A would be
∞
.
Fig. 5 Resistance Between B - A and B - C
A normal reading with the negative lead on C and the
positive lead on A would be: 2 - 18 K
Ω.
A normal reading with the negative lead on C and the
positive lead on B would be: 10 - 30 K
Ω.
If readings obtained are out of the above ranges,
replace the magneto.
Fig. 6 Resistance Between C - B and C - A
C
A
B
+ TEST LEAD
- TEST LEAD
C
A
B
+ TEST LEAD
- TEST LEAD
C
A
B
+ TEST LEAD
- TEST LEAD
C to B
C to A
