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2003 YZ250 will not start

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Take plug out, kick it over a bunch. Put brand-new plug in and try it. If it doesn't start by the fifth Kik twist throttle Wide open and kick another five times.
What has changed in the bike recently?

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My '03 YZ250 was hard to start...similar symptoms to what you describe. I ended up replacing the fuel inlet needle valve in the carb, and it made a big difference. The manual says to replace that part every two years, and I'm sure the one I replaced was no doubt several years older than that.

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