Hi all;
new member looking for some assistance.
Issue: Honda 420 FPA 2011 Quad stops after running approx 15-20 mins. No spark at plug lead.
Wait 20mins and starts fine, then stops 5-10 mins later - No Spark.
Actions: 1. Researched on I/Net, took advice and replaced Relay Module behind Seat. Result No Change
2. Heated and then cooled ECU - nothing conclusive
3. Sought info from place of purchase re Crank Shaft Position Sensor Coil
Info; Disconnect from LOOM and measure at plug (On RHS of Seat) Should measure 240 Ohms
Result; When disconnected from Loom and inserting dress making pins into wires, My Coil measured 120 Ohms
4. Reconnected plug to Loom, fitted Alligator Clips to Pins connected to Multimeter AC Volts, Started engine and let idle.
Result; Multimeter measured 2.9 Volts AC
5. Observed Multimeter, and as the mins ticked up, voltage slowly decreased.
Result; Just before motor stopped, multimeter showed 0.5 Volts AC.
6. Checked spark
Result; Nil Spark.
7. Disconnected Plug to Loom
8. Measured Pins (Wires to Crank Shaft Sensor Coil)
Result; Open Circuit (Infinite Ohms)
9. Allowed to cool 30 mins
10. Results; 120 Ohms.

Conclusion: Faulty Coil or Coil Solder connection inside Crank Case.

Future; 1. Cannot purchase Coil only, complete Alternator Stator/Coil from Honda $550.(Plus Manual says remove the motor from Frame.)
2. Found company in Geelong who rewind coils but have to remove Coil and show them to confirm if they can rewind (Approx $250)

Current Thinking; Will try removing Quad rear suspension, attempt to remove Rear Crankcase, resolder Coil Connections, refit crankcase and restart motor to see if the problem is solved.

Any comments or suggestions would be welcome.

Regards; Graeme