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Spark plug replacement

187 Views 2 Replies 3 Participants Last post by  jamesplankton776
Silmar9b9
30,000 mile interval ( service manual)

bike Is 19,000 miles on stock plugs @ 290 whp
the Iridium tip plugs in automotive internal engines are rated for 150,000 miles
guess I’ll go by the book and change them anyways
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