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Why is this diagram incorrect everywhere I look for it?

Every diagram I pull up for this RY4CSS, states that the spark plug is RCJ6Y. This is incorrect as the spark plug thread diameter is incorrect and won't even fit into the spark plug hole on RY4CSS.

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Hi,

According to this parts list the spark plug (item #12) is a Champion RY4C (link to show equivalent plugs if necessary)

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