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If the air box is off, it WILL start up, it will just run lean. Note that during startup, you should NOT be opening the throttle. The bike needs the vacuum to operate the fuel pump (at least until the float bowl is full) and will not be able to get fuel during cranking if it isn't in the idle position. The YY250T has an automatic enrichment circuit, and should start right up with the throttle in idle (unless, like right now, it's -7F and you have 15W40 oil in the engine... it WILL start, but it isn't easy, the oil is probably as thick as molasses, and it stalls out without any gas until it warms up a bit)
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