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OLD husqvarna rancher 50 not starting - seems to have spark, compression, fuel, timing?
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<blockquote data-quote="Vintage Engine Repairs" data-source="post: 8233456" data-attributes="member: 164888"><p>Yes it certanily can - most modern ignition coils have an ignition curve. The microprocessor that controls this calculates engine speed off the flywheel rotation against a quartz clock. This gives the micro processor the information to calculate engine rpm. With this information, it sends a signal to a transistor which then releases the current in the primary windings into the secondary to create voltage / spark at the pre determined time. If the microprocessor doesn’t close the transistor you get rev limitation. Therefore it goes without saying, when these components fail, the spark can be anywhere.</p></blockquote><p></p>
[QUOTE="Vintage Engine Repairs, post: 8233456, member: 164888"] Yes it certanily can - most modern ignition coils have an ignition curve. The microprocessor that controls this calculates engine speed off the flywheel rotation against a quartz clock. This gives the micro processor the information to calculate engine rpm. With this information, it sends a signal to a transistor which then releases the current in the primary windings into the secondary to create voltage / spark at the pre determined time. If the microprocessor doesn’t close the transistor you get rev limitation. Therefore it goes without saying, when these components fail, the spark can be anywhere. [/QUOTE]
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