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i really need help yz 125

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so i have a yz 125 and my case cracked so i replaced it and rode it for a little and anyways heres the problem im running into now, when i start the bike it idles super high and goes up in rpms sometimes i have no idea what it is theirs no air leak by the carb or air  box, what else could this be any help is greatly appriciated

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so i have a yz 125 and my case cracked so i replaced it and rode it for a little and anyways heres the problem im running into now, when i start the bike it idles super high and goes up in rpms sometimes i have no idea what it is theirs no air leak by the carb or air  box, what else could this be any help is greatly appriciated

you have a air leak into your crankcase, probably on the side of the case you replaced. Take it all apart again and make sure you seal the cases good, or find the leak and put some jb weld over it ( not recommended ) 

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or your throttle cable might be getting jammed, but its most likely the crankcase air leak

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