New KTM issue

Recently I bought a 2010 ktm 250 sx with approx 8 hrs on it. Bike is in great shape and it wasnt ridden hard. I took it out for my 1st ride and it ran good all day until the end of the day, I couldnt kick the bike over. After 5-10 mins of letting it sit it finally started up and was able to make it home worry free. Changed the tranny oil the next day and noticed that the fuel mixture screw on the carb was completely gone! It must have fallen out at some point during the day. I pulled the carb out and tore it apart to clean it and make sure everything was ok. The carb was nice and clean except for the idle jet was plugged with a bit of sand. Cleaned all the jets and re assembled and am waiting on a new fuel mixture screw to be ordered in. Was just wondering if there was any other possible damage done by this or has anyone else ever experienced this? Im hoping that this was why my bike was extremely difficult to turn over and it wasnt something else...

So after cleaning the carb and installing a new mixture screw and washers the bike fires up flawlessly. Hope this helps w/ anyone who happens to have the same problem.

When I say "could not kick it over" I mean the bike will not start. Not seized as in the kickstarter doesn't physically move. It does. Sorry my bad on the terminology.

I don't think that any dust or sand got into the motor. I narrowed it down that the screw fell out on my last 3 miles of riding, in non dusty conditions. Right away I gave the carb a thorough cleaning and there was a small amount if sand in the idle jet. Didn't ride the bike again until a new screw was installed.

Ive put about 4 hours on since then and the bike is running strong. I never checked the condition of the reeds or the piston, do you think those steps are really necessary now seeing the bike hasn't blown up yet?