1998-2004 Honda Foreman 450 factory service manual, Page 101Get this manual
FUEL SYSTEM
TROUBLESHOOTING
Engine cranks but won't start No fuel to carburetor Engine flooded with fuel No spark at plug (ignition system faulty) Clogged air cleaner Intake air leak Improper choke operation Inproper throttle operation Engine idles roughly, runs poorly stalls Improper choke operation Ignition malfunction Fuel contaminated Intake air leak Incorrect idle speed Incorrect pilot screw adjustment Starting enrichment (SE) valve stuck open Damaged starting enrichment (SE) valve seat Low cylinder compression Rich mixture Lean mixture Clogged carburetor Misfiring during acceleration Ignition system faulty Lean mixture Afterburn during acceleration Ignition system faulty Lean mixture Poor performance (driveability) and poor fuel economy Fuel system clogged Ignition system faulty Air cleaner clogged Afterfiring Ignition system malfunction Carburetor malfunction Lean mixture Rich mixture Lean mixture Clogged fuel jets Faulty float valve Float level too low Blocked fuel fill cap air vent hole Clogged fuel strainer screen Restricted fuel line Clogged air vent tube Intake air leak Rich mixture Clogged air cleaner Worn jet needle or needle jet Faulty float valve Float level too high Clogged air jet Starting enrichment (SEl valve stuck open Damaged starting enrichment (SEl valve seat Incorrect fast idle speed Incorrect choke cable free play Starting enrichment (SE) valve stuck or damaged