Reply To: GT250 EFI 2013 Sluggish Starts.
You could monitor the A/F ratio on the exhaust and also use some kind of heat gun to measure cylinder temperature so you know which one is still cold ? as you said it stalls in 15mins of working ? =
Measure that temp sensor on the front cylinder cold and hot values vs the manual figures.
Removing the flywheel does not require a full dismantle of the engine. Just the flywheel stator cover off, then extract the flywheel out , that’s it. You should be able to see if the sprag system is worn down (since it is 26,000 km , so it could be worth a look!)