Just out of curiosity, I see he raised the intake port to create a boost port. Has anyone else tried this on the Chinese jugs with a reed valve? You would think it wouldn't hurt if the piston window closes off the crankcase before transfers open which seals some crankcase compressed mix in between the reed and piston which would release once the piston goes down far enough to uncover the boost port and thus releasing this pressure. Since I changed my timing back to stock, I got my power back so I want to experiment on the stock garbage I got until she seizes or loses compression. I still have alot to learn. My jetting that was running perfect yesterday is too lean now that it is raining (plus surging possibly due to foaming and oil not mixed extremely well). What I thought was bad compression turned out being awfully advanced timing.