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sos yz250 won't start.

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I put my bike up for the winter and i got her out this week and i got her to start a few days ago after i cleared the spark plug and then tonight she wouldn't start. i put a new air filter on her. Thanks.

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Take carb off, clean carb. Reinstall carb. Take out old plug, put in a new plug. Put on new air filter. Empty out the old crappy gas, and put fresh gas in. Turn fuel on. Pull choke. Kick the kickstarter. Turn off choke. Rev engine. Ride off into sunset.

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assuming you have done all the listed stuff, does it have plenty of compression?

if not take off the pipe and look into the cylinder through exhaust port ,if piston /cylinder has any scoring or ring area is showing blow by its time for a top end.

also change the coolant

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