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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.
Based on the information you have provided, there are a few possible causes for the issues with your 2011 Arctic Cat 550 EFI. Here are some suggestions for troubleshooting:
Check the fuel injectors: If the fuel injectors are clogged or dirty, it can cause issues with starting and idling. You may need to clean or replace the fuel injectors.
Check the fuel pressure regulator: If the fuel pressure regulator is not functioning properly, it can cause issues with fuel delivery to the engine. You may need to replace the fuel pressure regulator.
Check the air intake and filter: If the air intake or filter is dirty or clogged, it can cause issues with fuel delivery and combustion. You may need to clean or replace the air filter.
Check the throttle body: If the throttle body is dirty or clogged, it can cause issues with fuel delivery and combustion. You may need to clean the throttle body.
Check the ignition system: If the ignition system is faulty, it can cause issues with starting and idling. You may need to replace the spark plugs or coil.
Check the battery: If the battery is weak or not providing sufficient power, it can cause issues with starting and idling. You may need to replace the battery.
It's important to note that these are just suggestions based on the information you have provided..
How much fuel in oil... or rather; is oil level high and smells of fuel? High oil level with fuel would imply an injector is sticking open.
It is liquid cooled... is it losing coolant?
Check condition of plugs. If oil fouled, replace and see if it will start/run. If still no start, pull plugs to see if they are saturated with fuel which would imply a stuck injector.
If it start/runs after replacing plugs, replace oil. If it continues to smoke is it white, black, or blue color?.
Did you change the plugs as well and should check your tps sensor to see if it is out of adjustment or is faulty the GPS sensor will sure do exactly what you have described
not familiar to your set up but as with any system encluding motor cycle. Get a hose and syphone all that you can out and fill with the proper gas. Start it up...it might be a little harder to start but once you get it started it will clear. I once had a guy fill my car with diesel...supposedly gas and I drove the car a long way then kept stopping up with gas. worked fine....sure did clean the engine.
You need to put a gauge on your fuel pump to test your fuel psi just because you have gas to your injector doesn't mean you have the right amount of pressure.
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