my brother z250 has been shutting off when ever he is ridening for no reasion it just shuts off do any of u guys know what would be the prob and what all do u guys check befor u go riding

how many time do u chage the oil and all that crap

 

it might be that 250ex hes been pushing around or put the fuel valve in the prime position

 

and where is that at it is a lot diffrent than my 400ex

 

nevermind it is in prime