1985-1986 Honda Fourtrax 125 TRX125 Shop Manual, Page 46Get this manual
FUEL SYSTEM
TROUBLESHOOTING
Engine cranks but won't start 1No fuel in tank
23, 45No fuel to cylinder Too much fuel getting to cylinder No spark at plug (ignition malfunction) Air cleaner clogged
Engine idlel roughly, stalls, or runs poorly 1Idle speed incorrect
2Ign ition malfunction 3, Rich mixture
4lean mixture
5Air cleaner dirty