Blackcat said:
I also don't quite understand what you are saying with the tranfer port thing. My KX has three power valves. One in the middle and two on the sides. The one in the middle I know is right. It's the outer two I'm not sure about. Also there is really no wear marks to go by.
The two on the sides that rotate are your transfer port valves. When you look in your exhaust port and physically open the powervalve, (the middle one), the two rotating valves on the side should also be in the open position. When the middle power valve is closed, the side valves will also be closed.
Unless your cylinder was bead blasted when you rebuilt the top end, there should be small shiny wear marks on the cylinder where the side valves rub the cylinder in the closed position. If those rub marks are still in there, you can use them to determine exactly where the closed position of the side valve is.
You can also look at the angle of the side valves and the port to align the valves. When you open the powervalve by hand to it's full open position, the side valves should be in the full open position. The angle cut on the open part of the side valve will align with the angle of the side of the transfer ports. If you look in the exhaust port you will be able to see this alignment. It's pretty obvious when you look in the port and open and close the powervalve by hand. If you are off by one notch either way, the side valve will either block the transfer port a little bit or open too far exposing the side of the port. If set correctly, it should line up with the edge of the port.
Good luck. :cool: