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I'm putting mikuni vm30 carbs on my 1981 Honda cm400c thats jetted for pod filters I'd like to know what kind of plugs I need and gap they need to be? I prefer Ngk plugs
 

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I would say the NGK D8EA plugs which were stock, if the carbs are even close to correct jetting those will work fine.
If you're using the stock coil then .026", GM coil is .035"
Sparkplug end caps are NGK XD05F
 
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