2007 wr450f

My dad has a 07 wr450 that is well taken care of. For some reason when it gets warm it randomly shuts down but restarts. He is a non aggressive ride in the desert. What do u guys think?

Could be:

clogged tank fuel vent hose

dirty filter

old gas

needs new plug

shuts off under load or with throttle on, or when idling?

If it is both, I tend to suspect electronics

if it is not under load or on the throttle, I would suspect pilot jet

of course, I don't know much

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