Again , Jetting ? 502,B&M 250 blower ??
#22
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Try this link. Click on the small pages on the left center, and expand the page. You can search on spark plug reference for more data.
http://www.sparkplugs.com/sparkplug4...g+Chart&mfid=0
http://www.sparkplugs.com/sparkplug4...g+Chart&mfid=0