i just bought a 87 250x for $300. they guy said he took it out riding and the float on the carb got stuck open and let alot of gas into the motor. as he was riding it back to his truck he said it just blew up. the quad still kicks over but makes a noise that sounds like a rod knock. it almost sounds like the rod broke and is clanking around. has this ever happend to anyone. or does anyone have any ideas what else it might be.

thanks