Reply To: GT250 EFI DSpec Stalls at Idle after Warm Up
Hi Sam,
this is an attempt to comment on all your 3 mail.
My bike is an EFI system and it still has 2 carburettors. The carbs control the airflow while the ECU controls the rest. I therefore don’t understand what you mean by “carbed”. In my system, what is a bit disappointing to me is that the fuel injectors spray into the bottom end of the carburettors and not directly into the cylinder. While I don’t like it, this of course is not the reason for my problem.
Ignition timing is determined mechanically, by the timing chain plus cam shafts and electrically, via one pickup coil near the magneto together with the ECU. The pick up coil only generates one pulse per revolution so the ECU is the one which estimates at what point the 2 sets of injector and spark plug activate.
The valve clearance is according to spec and the cams are properly aligned with piston at TDC so this cannot be the reason why combustion is leaking back into the carb!
I have looked at the ebay coils you indicated. They are totally different to mine. Most important difference is the connector. Mine are Delphi as are most of the electrical components around the engine.
If you have a fault which only appears after the engine has completely warmed up then I am afraid measuring the DC resistance at cold may not point you to the fault. Mine too measured up properly at cold but I still was facing idling fails when hot.
I am glad to hear that you have found the culprit for your system. I would not have thought these to be the issue but then again I am just an amateur at bike repair.
Regards
Joe