So my scrambler 500 4×4 started having issues about a year or so ago it wouldn’t accelerate the way it should the next time I rode it several months later it was a lot worse not it will only go about half throttle. Now It idels fine but once you give it gas it dies. I opened the air box thinking the carbs were gummed up so I was going to spray carb cleaner in it but I relized it is blowing exaughst out of the air box I was thinking that the valves spacing was off so I pulled it apart and checked them I adjested them to the what the manual said and it is still doing the same thing. Anyone have any ideas of why it would be doing this