NGK ER9EHIX Iridium Spark Plug
DENSO IY27
CSC carries the NGK above, and a chain kit in DID as I recall, I have both, installed the NGK the chain is to be installed when needed. So far my original chain is fine.
Mine is a yellow 21 and is lots of fun.
There's a big RX4 thread on advrider.com, and the facebook groups for CSC, so both of those plus this site are must see's.
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