Mark i think that you will find that the problem thqt you had with your engine not being able to develop full power can be traced to the fact that when your dropped the seat in that cylinder the vacuum in your whole manifold will be severly disrupted. If i understand the ellison needs steady vacuum to fuction properly. A normal carb would not be effected by thisin such alarge degree. Ifthe cylinder just stopped working but kept opening and closing the valves as in normal operation the vacuum in the manifold would not be altered. What will cause the engine to rise and fall in r rpm and power as you described could be caused by the seat resetting itself for brief period of time and then coming loose and holding the valve open. The operation of the ellison requiries STEADY vacuum. I think that you will find when you get your heads fixed your problem will disapear Kip
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