I recently purchased a HF blue clone for 79.99 plus tax (20% off coupon):thumbsup:. two questions though, (1) everytime is start it i have to full choke it, whether it's warm or cold. is this because the carburator is set up too lean? (2) when the engine is running full throttle, it surges. no other rpm just full throttle (approx 3600rpm). what are a few possible causes. great site btw!!!