Engine dies after 20 minutes of running.

Hi Morley, does the bike misfire when it is about to stop?

might be a problem with a blockage in your fuel system... are the electrics also cutting out?

If the fuel filter (strainer) is OK, carb gives enough fuel for the load you apply, air filter is dry and clean, your problem may be the low oil level protection.
Check if generator is at level position.
After the oil is distributed in all the engine its level may go less than the measuring sensor level. Try to put some more (not much) oil. 
If this will not help your measuring sensor may be bad and switch off when the oil gets hot.

Hate to tell you this, your bike does not have a carb. It is fuel injected. If the bike is running okay, don't fix it. If it runs poorly, let the dealer fix it. You don't want to get into the system and accidentally mess up the fuel mapping in the Fuel Injection system. These things get really technical very quickly. Best wishes.

Hey Doug,
I would first suspect a clogged fuel filter, then ignition components and air pathway obstructions from filter to exhaust.
Sounds like the bike wants to run and does run...when it gets what it needs.
If it has a carb, check the float bowl for crud that can clog the jets. You may need to replace fuel line, but not likely.

DRAIN CARBS FROM PETCOCK AT BOTTOM OF EACH CARB MAKE SURE FUEL DRAINS COMPLETELY THEN TURN FUEL BACK ON, IF THIS IS AN INJECTED MODEL DRAIN TANK AND FLUSH THEN RUN IT HARD FOR 20 MILES OR SO, MAKE SURE YOUR OIL LEVEL IS OK

If you need further help, I’m available over the phone at https://www.6ya.com/expert/michael_00678fd4800d19c5

If the bike has sat for a long period of time without being run - the gas that is sitting in the carb(s) will shellac.. Then the carb(s) would need to be cleaned and "rebuilt"..

If you are getting a nice bright blue spark then no, the last time I had a problem like this it was sugar in my tank. If you taste a bit off your finger and it is the slightest bit sweet, then some one has sugared your tank. If so just flush the tank with a little fresh fuel and then flush the carb, and fuel lines by spinning the engine over for a bit then try to start again.
Is yours an electronic ignition or points. If points gap could be wrong or even timing slipped. That has happened to me also.

Check the vent in the fuel cap to make sure its free to breath. It could be creating a vaccume in there and starveing for fuel. Maybe run it with the gas cap off and see if the problem gos away.