2004-2005 Honda TRX450R Factory Sevice Manual, Page 86Get this manual
FUEL SYSTEM
TROUBLESHOOTING
Engine cranks but won't start
No fue in ta nk No uel to carbu retoClogged fuel st rain erClogged uet lineClogged fu el ank brea th er hose Too much fu el etti ng to he eng ineClogged ai cleaner
- Flooded ca rburet Intake ir lea k
Contaminateddeteriorated uel
- Clogged jets
Clog ged starting enrichment (SEl alve ci rcu it Improper cho ke pe ration Improper throttle operation No spa rk at plug (fa ulty ignit io systempage 16-5)
Lean mixture Clogged ue jet s