I have a Have an 05 Honda Rancher 350es. I sat up for a while and would not idle very hard to start. Rebuilt the carb and now it starts fine...idles. ATV loses power as I go up in gears. Pulls well in first...tops out in second. When I shift into third is when I start having trouble. Tops out about 17 or 18 Mph and gets no faster in forth or fifth. It seems like it starts bogging down. Any advice?
Sounds like you are getting more air in there when going fast, so it could be the diaphragm isnt seated good enough or the slide its attached to. Take that apart and give it an inspection if you still have problems after checking the fuel.
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