1985-1986 Honda ATC250R Shop Manual, Page 58Get this manual
FUEL SYSTEM AIR SCREW
CARBURETOR ASSEMBLY
Install the chokeidle speed knob and tighten the lock nutInstall the air screw and return it to its original position as noted during removalAIR SCREW OPENING: 2-14 turns out Install the baffle plate, slow jet, and main jet
SLOW JET
Float Level Inspection
Measure the float levelTo adjust the float level, bend the float arm carefully until the float tip just contacts the float valveFLOAT LEVEL: 16 mm (0.63 in) Install the float chamberReinstall the carburetor onto the engine