What spark plugs for 340

Scody21 said

Autolite’s belong in the Garbage Can… just like e3 spark plugs and Fram oil filters

NGK BKR6E or BKR5E or the Champions your running…

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Champion plugs also belong in the trash . I'v had excellent luck with autolite plugs. Back in the day when I did use Champion plugs they were usually good for a couple thousand miles at best.