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Better & best spark plugs for trolling & WOT for long running periods ?

C

cyclops2

Regular Contributor
Are certain brands & types able to do both types better ? I troll for 15 minutes & then go to W O T for a long run to a new place.
The 1999 Evinrude 9.9 hp is running 50 : 1 ratio. Stock Champions seem to work O K. But the Bosch & NGK stock ones remained carbon free a lot longer.

Anyone found others also ?
Thank you.
Rich
 
I ask because my old mind can not recall the many different types of electrodes & metals used some companies that are far better than the standard type.
 
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