Chinese 250 won't start after going through mud

[shitboxlover 0]

I was out riding my loncin hunter 250 yesterday when i thought i'd go through a mud hole but it did not liie that and after that it started running bad but still ran all the way home, i shut it off for the night and when i was going to start it this morning it would not fire unless i had full throttle and even then it ran bad with a lot of white smoke. Does anybody have any idea if it can be fixed or if i might as well buy a new quad

[MarkinAR 123]

Likely just sucked water into the carb.  The white smoke is most likely water burning off from being in the fuel.  I'd pull the carb apart, clean it good and reassemble.  That assumes the white smoke is not blue oil smoke, and in which case it's most likely a seized or cracked ring.  But you can tell the difference....burned oil smells like crap and steam from water in the fuel doesn't have a smell.