2001-2003 Honda TRX500FA Factory Service Manual, Page 358Get this manual

2001-2003 Honda TRX500FA Factory Service Manual, Page 358

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LIGHTSMETER SWITCHES Suspend he oi hermosen sor in pan of eng ine oil on an electr ic heating eleme nt and easure he resistance hro ugh he senso as the oil heats up THERM OMETER
Replace the oil