It does have the divider in the exhaust port. The carb is a Walbro WA-167A. I have it running between 3000-7000 rpms.
I'm having a little trouble with transition of the throttle. Sounds good on the bench but stutters on take off and when you throttle down
in flight. Tries to go into 4-cycle mode.
Please go to my youtube link and you can listen for yourself. What carb adjustments would you recommend?
These videos are of my very first flights with a gasser.
Thanks
http://www.youtube.com/watch?v=PX685o4LQoU
http://www.youtube.com/watch?v=xC0QXAcbSSY
http://www.youtube.com/watch?v=L8C991s0kS8
http://www.youtube.com/watch?v=xnER8e8Nhvc