yup, just as the title says. i seized my bike this weekend. '00 426. im not sure what i could be. lemme start at the beginning and see if someone can help me out on this one. the oil and filter had been changed 1 ride before. not internal engine mods. BK carb mod. stock header wrapped with exhaust wrap. cut stock silencer with PMB end cap. 170 main jet up from 162 stock. engine ice. motul 3000 SAE 10W-40. nothing but 91 octane. CR8E plug. when it seized i was riding out in glamis. i had only been riding about 10mins. nothing really hard. cruising. was in 3rd about half throttle through some whoops when i let off and it died. so i pulled in the clutch to roll start it and it just stayed locked up. so i stop. pull in the clutch and decomp and go to start it and the kick starter wouldnt budge. so i put it in neutral and nothing. as i sat and waited for my buddy to come back with his truck i noticed there was a leak between the carb and the airbox. the plastic part the is bolted to the carb that is between the airbox and carb had been pulled away from the carb. the screw wasnt loose though. the metal sleeve inside the plastic part had pulled away from it. i didnt notice the bike running lean or it overheating at all before this happened. as soon as i was able to i pulled the carb and check for any excessive amount of sand in there. none. nor was there any in the intake track on the cylinder head. i then pulled the plug and it didnt show any signs of being too lean. i am stumped. it is full of oil and coolant, i checked before i went on the ride. transmission still shifts and the clutch isnt stuck. i am hoping it is just a ring maybe? top end only? i dont want to have to pull it apart for the bottom end. what do you guys think it could be? sorry for such a long post.