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I have a 2014 rmz450. Never had a major problem with it. Has about 100 hours on it. Today i went trail riding near my house (I never trail ride) and had stopped my bike on a trail to move a log. When i went to start it back up it would only start and idle When I held the hot start . i went to check the idle screw and it fell right out. I had to push my bike over a mile home. Never have i seen this. Anyone know how/why this happened ?