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Based on the information provided, there could be several possible reasons for your Arctic Cat 550 H1 EFI to stall. Here are a few potential causes to consider:
Clogged Fuel Filter: A clogged fuel filter can cause a lack of fuel flow to the engine, leading to stalling. Even though the fuel pump and regulator were replaced, it's possible that the fuel filter may still be clogged or dirty. Consider replacing the fuel filter as a troubleshooting step.
Faulty Ignition System: If the ignition system is faulty, it can cause the engine to stall. This could be due to a number of reasons, such as a failing ignition coil or spark plug. You may want to have the ignition system checked by a mechanic.
Air Intake Issues: Problems with the air intake can also cause stalling. A clogged air filter, for example, can restrict airflow to the engine and cause stalling. Make sure to check the air filter and clean or replace it if necessary.
Electrical Issues: Electrical problems, such as a faulty sensor or loose connection, can also cause stalling. You may want to have the electrical system checked by a mechanic.
Fuel Injectors: The fuel injectors may not be working properly, which can cause stalling. Have a mechanic check the fuel injectors to ensure they are functioning correctly.
it could be something clogged up and it is running out of fuel,i would check fuel lines,carburetor,etc. does it start right back up?if not,give it a few minutes to let fuel fill up carburetor,then try starting.if it starts back up after letting it sit a few ,sounds like fuel starvation to carburetor.
right before you stored when you added the fuel stabilizer did you have fresh gas and did you run the engine with the fuel stabilizer in for 5 to 10 minutes
This is a fuel injestor fault. Mine did this after sitting in the garage for a while and the battery went dead. Changed the battery and the code went away and bike ran fine, however with yours, if the battery is good, you got an injector failure
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