This sounds like a major project, I am looking at the Yahama 80cc now and the exhaust port is in the front of the engine with the intake to the rear. They have engineered a very convoluted exhaust pipe and expansion chamber before dumping into a muffler about the size of the one on the Chinese. I can understand having to make both an exhaust and intake manifold to adapt to the Chinese engine. Using the YZ configuration, the only problem I see is a hot exhaust by your left leg. They used a good heat shield. My question is why are we redesigning the whole exhaust and intake configuration. I have no experience in 2cycle engines. This question is for real, not to question your experience and knowledge of 2 cycle engines. The only thing I can see is the exhaust and heat shield is futher outside the frame of the bike than one might want. Here is the clincher, would we see a power increase worth the effort or would you just chalk it up to a fun project? I have had many of those and sometimes enjoyed the project more than the expected outcome. Thanks