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  1. NGK Iridium Spark Plug for Stock Groms

    Grom How-To's and Guides
    Most of the spark plug threads here are for big bores or setups where the stock heat range is too hot. NGK also has an iridium in the stock heat range that does not tend to cross-reference with the stock plug, CR6EIA-9. I went with heat range 6 because most of my riding is commuting: low engine...
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