I just bought a 300 ec -07 and had the same problem. My solution was to clean the hoses to the carb and powervalve. Another guy had same problem and it was also the hose to the powervalve. that was clogged. ( Sorry if i write in bad english)
Hello Ron
I´m going to buy a bigger bike ( now i have a gasgas EC200 -04)
Do you have any 2 stroke for sale?
Can you arrange shipping to Sweden and how much would that cost?
Stefan