Hi, my crf has been sitting for about 6 months with no fuel in the carb or tank. I added 2 teeth to the rear sprocket and took it out this weekend. I had a LOT of popping going on everytime the bike deaccelerated. What is that all about, never happened before. Is it because the bike sat? Would the gearing do this? Should I adjust the fuel screw out a half or quarter turn? Thanks for the help, Nancy