My 1990 trail boss 350l 2x4 starts and idles fine but when you go to rev it up it bogs! It will not move! I just cleaned and rebuilt the carb and jets, put in new air filter, and added new gas. After I put it all back together i still had the same problem. I then checked for a vacuum leak and that came up as a negative as well! I'm stumped. It ran absolutely perfect then I loaded it up on the trailer to take home from the cottage and it hasn't ran right since! Please give me any advice!! This is my first Atv and I've only rode it for aprox 6 hrs! I don't want this to ruin my Atv experiance! Please help thanks!