i have got ngk pfr6-b plugs in my 91 pulsar i have found out that they should be pfr7b-9 will pfr6b's cause any damage or problems and should i replace them with the pfr7b-9's?
Yep put the 7s in, they are one heat range colder and will protect your engine against plug failure. (possibly pre ignition too) If you're modified and running around 1bar or more go to heat range 8
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