So ive had this snowmobile for about 4 years now. i havent used it too much. it has a key start but it broke with the key in it so its always on but i cant use it to start it. ive had to pull start it. It has 900 miles on it. A few days ago we tried starting it by pulling it and it only turned on for a minute and then shut off after a while of trying to start it. Yesterday the pull start was jammed for a while and then out of no where we were able to pull it and it started and ran fine. we drove it for about a half hour then shut it off. this morning its back to not starting. Anything i can do? i dont have much knowledge about snowmobiles so try to make it easy on me?