Hello. I love all of the experimenting many of us are doing. I would like to offer you all our new, radically different intake manifold for the china girl engines. We make them here in New Hampshire USA! I have read many reports of people having difficulties getting the CNS carburetor to work properly for the engine. Most of the performance problems are caused by a overly rich air/fuel mixture. With our high performance intake, you won't have that problem, in fact, you might even need to further enrichen to mixture. The CR Machine high performance intake addresses this problem totally differently than anything else out there. In fact, I have not seen anything like it for two stroke engines. We think that CR Machine has finally finished the development of the boost bottle, which never really progressed passed the hodgepodge of pipe fittings, hose and zip ties! Why it took so long, I don't know, but the progress has begun again. Check out the intake on our Ebay store, CR Machine Manufacturing, where it is available for $60. This intake manifold essentially "smooths" out the intake pulsations which the carburetor gets from the engine. A relatively sharp intake pulsation will draw more fuel from the jet compared to a softer intake pulsation of equal volume. Another advantage to this manifold is that it is by far the most free flowing design. We also sell reworked, balance engines! Have fun!!!!