Our DR200 also had the combination of relative low miles+long years=hard starting/rough running when we got it. I suggest remove tank and clean it. I had a lot of varnish/scale from old gas. Not cleaning the tank just puts you on a cycle of cussing and recleaning the carb. Then service the carb and clean it twice. I also added an inline fuel filter. Even with the initial fuel/carb issues...the DR has proven to be simple and easy to work on. We love this little bike! Now a great runner and solid smile machine.