I have this bike, it´s in great condition but have two problems, one the idle is messed up, it rides fine if I keep the throttle revved but when I stop and let the throttle go it cuts off, and also when I stop riding gas leaks out of the first carb valve. How can I fix these problems, and do you know anyone who wants to buy this bike, I´m in Philly pa...the engine and bike are in great condition