1999-2002 TRX400EX Fourtrax Service Manual, Page 38Get this manual
MAINTENANCE
FUEL LINE
Removethe front fender (page2-2)Check the fuel line for deterioration, damage or leakageReplacethe fuel line if necessary
-FUEL LINE
THROTTLE OPERATION
Check for any deterioration or damage to the throttle cableCheck that the throttle lever for smooth operationCheck that the throttle opens and automatically closes in all steering positionsIfthe throttle lever does not return properly, lubricate the throttle cable and overhaul and lubricate the throttle housingFor cable lubrication: Disconnect the throttle cable at its upper endThoroughly lubricate the cable and its pivot point with commercially available cable lubricant or light weight oilIf the throttle lever still does not return properly, replace the throttle cable
Reusing damaged or abnormally bent or kinked throttle cable can prevent proper throttle slide operation and may lead to loss of throttle control while ridingWith the engine idling, turn the handlebar all the way to the right and left to ensure that the idle speed does not changeIf idle speed increases, check the throttle lever free play and the throttle cable connectionMeasure the throttle lever free play at the tip of the throttle leverTHROTTLE LEVER FREE PLAY:mm