Can a spark plug....

Can a spark plug

be the root of four stroking sound at WOT?

be the root of power loss after running more than 5 minutes?

Re: Can a spark plug....

could be, its a cheap part to change or try a known good one

Re: Can a spark plug....

If the plug is gapped too wide then at speed it will misfire but it will be consistently bad, if it is ancient resistor plug then the resistor inside can be tired and suddenly die out after a certain amount of time running. Usually plugs that ancient are so old the center electrode has been microblasted down to level with the ceramic.

If the points are not properly indexed they can float at speed and give you intermittent spark.

Two components which will usually fail from heat soaking is the condenser and the resistor in the cap.

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