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Here is a little article on reading spark plugs
ReadthatPlug.pdf (You do not have access to download this file.)
Plugnumbersandwhattheymean.pdf (You do not have access to download this file.)

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

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