1982 atc 250R carb

[yamaha125trimoto]

how meny MM is the stock kehin carb on the 82 atc250R ?? and also i know this form is for "TRIKE " stuff but yesterday i was riding my polaris 250 Trail Boss around where i live and i go to my house which is out in the country anyway i pull up in my driveway and think oh im just running in for a second and it has a key so i leave the quad outside the gate i go inside for like 5 min come back out my girlfriend just got there and tells me that when she pulled up a guy was siting on the quad she didnt pay it any mind and then she looked again and he was gone the quad was still there but he stuck something in my ignition switch and broke it 2 more seconds and he probibly would have had it started Im verry lucky i know but i wanna know anyone knows of a heavy duty metal ignition switch that would work the plastic ones are worthless

thanks