2001-2005 Honda TRX250EX Sportrax TRX250EX Factory Service Manual, Page 272Get this manual
IGNITION SYSTEM
TROUBLESHOOTING
Inspect the following before diagnosi ng the system- faulty spark plugloose spark plug cap or spark plug wire con nectionswater got into the spark plug cap (ignition-coil secondary voltage leak) No spark at spark plugs
UNUSUAL CONDITION
PROBABLE CAUSE (Check in numerical order)
Ignition-coil primary voltage
Low peak voltage