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18-7. AUXILIARYGAP SPARK PLUGS.Auxiliarygap
sparkplugsproducea jaggedspikeat the endof the spark
lineand causethe tailof the firstoscillation
to appearalternatelyshortand long.Referto Figure18-6.
18-8. MAGNETOSYSTEM.A magnetosystem pattern
polaritywitheachsparkplugfiring,as illustrated
alternates
in Figure1B-7.Do not usethe 25 KV SPARKVoltageposition on the scope when testinga magnetosystem,as it
responds
to onepolarity
only.Useeitherthe DISTRIBUTOR
patternor 50 KV positions
to viewthesewaveforms.
18-9. ROTARYENGINE.A Mazda,two-sectionrotary
engineproducestwo sparkpatterns,one for each engine
section.Thesepatternsrepresentthe actionof eitherthe
leading
o r t h et r a i l i n g
i g n i t i o nd,e p e n d i nogn w h i c hi g n i t i o n
system(leading
is beingtested.The normalpator trailing)
rsthesameasthenormalpattern
ternforoneenginesectron
f o ro n ec y l i n d eor f a p r s t o n
engrne
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