2001-2003 Honda TRX500FA Factory Service Manual, Page 58Get this manual
MAINTENANCE To prevent damag-
ing the iridium coo tmg the cemer elec trode, use wife type fe ele r
Measure the spark plu gap between the center and side elect rodes with ire-ty pe feeler gauge
WI RE TYPE FEELER GA UGE
M ake sure tha th 1.20 mrn 10.0 47 in) wi re type feel er aug can not be inse rted into the gap gaug to check th If the gauge can be insert ed int the gapreplace he spark plug gap plug with new neDo no adjust he spar plug gapIf $crew the spark plu in the cylinder head by hand to the gap JS OUt of prevent cross -t hreadi ngspecificat lOfl, Tig hten the spark plug replace with new
oneTORQUE18 Nm (1.8 kgfm, 13 Ibfft)