2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 289Get this manual
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I 17IGNITION SYSTEM
Spark plug Standard INGKI Standard IDENSQI For cold climateJbelow S"C!4 1F (NGK) For cold climatejbelow S"C4 1F (DENSO) extended high speed riding {NGKI For extended high spe