1986-1989 Honda TRX250 FourTrax 250R Service Manual, Page 40Get this manual
FUEL SYSTEM
TROUBLESHOOTI NG
Engine cranks but won't start No fuel in tank No fuel to carburetor Too much fuel getting into cylinder No spark at plug (ignition malfunction) Air cleaner clogged Deteriorated premix Engine idles roughly, stalls, or runs poorly Idle speed incorrect Ignition malfunction (page 15-2) Low compression Rich mixture Lean mixture Air cleaner clogged Air leaking into in let pipe Fuel contaminated Lean mixture Carburetor fuel jets clogged Fuel cap vent clogged or blocked Fuel filter clogged Fuel line kinked or restricted Float valve faulty Float level too low Air vent tube clogged Worn crankshaft seal (alternator side) Rich mixture Starter valve stuck open Worn or damaged starter valve seat Faulty float valve Float leve too high Carburetor air jets clogged Air cleaner dirty Worn crankshaft seal (c lutch side)