2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 70Get this manual
MAINTENANCE MAINTENANCE
SERVICE INFORMATION
GENERAL
Place the vehicle on level ground before starting any work The exhaust contains poisonous carbon monoxide gas that may cause loss of consciousness and may lead to deathRun the engine in an open area or with an exhaust evacuation system in an enclosed area