go to www.sparkplugs.com and get the BR9ECM's as Honda specified. The plug does cross reference to other plugs (ND W27EMR-C) but your best with the standard plug.

Trying to go cheap generally will cost you more in the end due to it not being the right temp, lenght, etc..

I have been using sparkplugs.com for almost 10 years now with no problems. quick shipping and good prices.
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Charles Gallant