Hi there,I purchased a bone stock 2007 drz 400sm with three hundred miles on it.after rideing the bike about 50 miles or so,when I would hold at a steady speed it would start cutting out and die.so I decided to go ahead and have the Motorcycle shop jet the carb,put a K&N filter and yoshimira exhaust on it.the bike ran great for about a year but now its doing the same thing as before.I have had to push my bike home two times this week,thanks for any help.