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So my friend wanted me to change all the fluids on his 250sx after sitting all winter so I did. Before i changed the gear oil I started it up for a little and it ran good. After I changed all the fluids including draining the old gas out I started it again and it idled good for a few minutes then I shut it off and now it wont start.....ive checked everything plugs not fouled or anything I used the exact same 40:1 ratio and premix he uses.... anyone got any suggestions????

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Make sure the carb is getting gas maybe something clogging up the petcock or somthing in the line. Just a starting place.

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After following levko82's advice check if you have a spark. Fuel and spark are the first two things to check, then you can further investigate...

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Also i just noticed after trying to start it fuel is leaking out of the lowest hose on the carb...
 
Float level issue ,bet it's dirt in the needle valve

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