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CDI Blowing Pistons


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Just a quick heads up. The component often overlooked when trying to sort out an engine problem is the CDI, usually because the engine still runs, so the CDI must be OK? What can and does go wrong is the inbuilt advance/retard.

It will fail either of two ways. If the CDI fails fully retarded, you’re lucky, but you could end up thinking fuel or wiring problem. Or if it fails fully advanced, it will eat pistons for breakfast. If you cannot 100% find the cause of a blown piston check the CDI. Substitution is the quickest and safest way, failing that use timing light. Fortunately a lot of units share the same CDI so they are readily available. Parajet is a local source. Failure is not a regular occurrence, but worth putting on the engine problem checklist.

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