MTD Engine - Series 350/450/650
19
7.18. Simple spark-testers are readily available and
inexpensive. Thexton Part # 404 is available
form a variety of retailers, and similar units are
available form other manufacturers.
See Figure 7.18.
7.19. At operating speed, the ignition should produce
voltage approaching 12,000. See Figure 7.19.
Figure 7.18
Instructions on
back of package
Figure 7.19
1 reticle = 4,000 Volts
waveform is
3 reticles tall
7.20. At pull-over speed (~
600 RPM), voltage should
be at least 8,000. See Figure 7.20.
NOTE: Flash-over voltage will vary with spark
plug condition and gap.
NOTE: Pull-over speed may vary from operator
to operator.
7.21. Resistance in the primary windings of the igni-
tion module, measured between the spade ter-
minal and the laminations, was observed to be in
the 550-650 Ω range. See Figure 7.21.
Figure 7.20
Pull-over speed: waveform is half-way
between 2nd and 3rd reticle (10,000 V.)
Figure 7.21
Probe to
laminations
Probe to stop switch
spade terminal
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