1988-1992 Suzuki LT250R Service Manual, Page 107Get this manual
I 5-5 FUEL S'r1STEM
This systeml supplies fuel during engine operation with piston valve closed or slightly openedI The fuel metered by the pilot jet is mixed with the proper amount of air metered by the pilot air screw and is separ1ted into fine particlesMixture then exits into the main bore through the pilot outletThe air TMTMTMTMTMTMcontrols the amount of mixtureWhen the piston valve opens little, the mixture jets through the by-pass hnd the pilot outlet