I'm currently using a real 4-stroke carb, it came stock on the engine. I already beat my head against the butterfly carb wall, getting a correct pulswe and sizing the carb is more wheel re-inventing than I want to persue. I found that I can buy a WYK-194 barrel type carb.

http://www.davesmotors.com/s.nl/c.88...t.A/id.4132/.f

I can't find much information and they don't know at Dave's if the WYK is a proper 4-stroke carb that runs off the intake manifold pulse. I am 80% sure that the WYK is the correct type and works on both 4 and 2-strokes. The one they sell is a little bigger than what came on the engine. It is 1.5 mm larger, 9mm vs 10.5. The thing that I am after is the high and low mixture screws on a 4-stroke carb of about 9mm venturi. Perhaps someone has a better idea than the carb I found at Dave's ? Or, will Dave's carb work properly on the 40cc Briggs?