2013 yz450 wont stay on

hi I got 2013 yz450 a few weeks ago. Everything was running right until i let it sit for 4 days and now the bike starts but shuts off to keep it on you have to stay in throttle does anyone know what it might be. A few friend told me it could be the spark plug. but I'm not sure

Edited by alexp96

Will it stay running if you use the cold start knob, or just turn the idle up?  

Will it stay running if you use the cold start knob, or just turn the idle up?  

nope just kept shutting off

Sounds like a sticking injector.  Check it for codes.  Might try a top tier injector cleaner fuel additive.  Read the instructions on the label and figure when they say a full tank, they mean 16 gallons. 

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