2001-2006 Honda TRX 300EX Sportrax 300EX Factory Service Manual, Page 290Get this manual
IGNITION SYSTEM
TROUBLESHOOTING
Inspecllhe following befora iagnosing the system- Faulty spark plugLoose spark plug cap or sparl!; plug wire connectionWater gal inlo the spark plug cap (leaking the ignition coil secondary yol tageTemporarily exchange the ignition coil with known good one and perform the spark leSIIf there is spark, the exchanged ignition coil is fau ltyNO SPARK AT SPARK PLUG
Unusual condition Ignition coil primary
Probable cause (Check in numerical Of'derl
Low peak voltage
1Incorrect peak vollage adapter connections (system is normal
voltage