I have a 91 blaster and every once and a while. While I'm riding it, and I'm slowing down normally, it will back fire and shut down. And every once and a while every time I push the throttle it has like a hesitation/want to bog down kinda. Any idea on what would cause this and what I can do to fix it. The last time I rode it I was riding it and it started to bog down and it backfired and now it won't start up again. My blaster is completely stock no after market stuff on it. The jet sizes are 32.5 and 230.