The bike starts instantly, holds idle purfect, but as soon as you try to throotle it starts sputtering and popping. I did the search and found one post with the problem, but the person never posted what fixed it. Some people said it could be the parking brake switch. I did a search on that and had no matches found. The carb is clean and the jets are new. I am running 145 and 150 main with 25.0 pilot. I have a stock exhaust and filter with no lid. The bike idles excellent and starts instantly cold or hot. I am at 800 ft elevation and the mixture screws are 3 turns out.