Congrats on the purchase, i have a 300 aswell, the jetting works on see level altitude, where are you riding, mine is in bits at the moment for a full rebuild so i can check my jetting but i am at sea level, go to the manual and it tells you what you are suppose to be running or you can go to a go kart shop and get the exhaust temp sensor which will also tell you what you need to know. go kart stuff is real handy as they are high performance 2 strokes aswell and run on the border of destruction too.
