Bikes left in the crate
It would be a good idea to flush out the carbs before trying to start the bike. Fill up the tank with fresh gas and drain some thru the drain screw on the bottom of the carb. In the eightys yamaha developed a carb cleaner just to deal with the vast number of bikes that sat around for 3 to 5 years before being run. A lot of those bikes are still running today. I just sold a yamaha that had sat for two years. I had charged it's maintenance free battery once a month for two years...the battery was still good and the bike ran perfectly.
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