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1976 cb550 spark plugs

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commando1954:
What spark plugs are best for my cb550k 1976?

peterengland:
D7EA or D8EA

Oddjob:
Seems to be a trend for fitting Nippon Denso recently. Seems there are quite a few fake NGK plugs flying around.

X22 ES is standard but X24 ES also seems to be used a lot.

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