99 trail boss 250 will not turn off

hey everyone not sure how this works but having a strange problem. I have a 99 trail boss 250 and it starts and runs great. it has been about a year since I had it out and now it still starts and runs but will not shut off. I have to pull plug wire to get it to stop running. any help will be great. as it is I cant ride safely or let kids ride at all. thanks in advance.

99 trail boss 250 will not turn off

hey everyone not sure how this works but having a strange problem. I have a 99 trail boss 250 and it starts and runs great. it has been about a year since I had it out and now it still starts and runs but will not shut off. I have to pull plug wire to get it to stop running. any help will be great. as it is I cant ride safely or let kids ride at all. thanks in advance.