1988-1994 Honda TRX300 Fourtrax, 1988, 1990-1994 TRX300FW Fourtrax Service Manual, Page 40Get this manual
MAINTENANCE Major adjustments are made with the lower adjuster: Remove the fuel tank (page 4-3)Adjust by loosing the lock nut and turning the adjusterTighten the lock nut and recheck throttle operationInstall the fuel tank and check throttle free play again
CARBURETOR CHOKE
The choke system uses fuel enrichment circuit controlled by starting enrichment (SE) valveThe SE valve opens the enrichment circuit via cable when the choke lever on the handlebar is moved to the leftCheck for smooth choke lever operation and lubricate the choke cable if required