450F Starts but doesnt run

We pulled my brothers WR out of storage today and tried to fire it up. When we got it started it ran for about 15 seconds and then it died. Im not sure if I should let it rin and warm up, or pull the carb off and give it a good cleaning. It starts with no assitance from starting fluid, just wont run. Any ideas? Thanks in advance :thumb:
 
I got some stuff to do to the bikes tonight. Clean the carb and spoon on some new tires for both. Heading out for a ride tomorrow. Ill let ya know how the carb turns out
 
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