Skywatcher wrote:Hi 38
On these CDI ignition engines, flywheel position has no effect on whether the coil fires or not, the flywheel key just makes sure the spark hits at the right time. The most common reason why these engines lose their spark is a seizing or seized engine control cable not fully opening the ignition grounding switch. As BG says, disconnect the small green wire from the coil to isolate the ignition system from the rest of the machine.
The spark tester I use is the Stens 750-018 https://www.stens.com/search?keywords=750018 which works on the KISS system. Remove the sparkplug from the engine, connect the tester to the plug wire, clip it to a cooling fin and spin the engine. If the ignition system can jump the 3/8" gap at atmospheric pressure, it can jump the 0.030" gap under engine compression. Hope this helps,
Sky
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