Thats funny... I read somewhere else where they wanted the slot in the spray bar aimed straight down the throat, and as a mechanic, that sounds more logical to me... The straightest shot is always better for performance, except of course with accellator pumps, where ya need to get the fuel past the edge of a throttle plate (butterfly) as it starts to open. Changing the angle of attack with the spray bar slot will only impede the flow of fuel at all throttle settings. If your midrange is too rich, you need to lean the bottom end and fatten up the top end. If the carbs are designed poorly, then the carbs are designed poorly, but I think most problems are tuning issues. Correct fuel pressure and back pressure is always an important factor with any fuel metering system, though some carburetors are touchier than others. Carbs with float bowls are more forgiving about the fuel pressure, but back pressure still effects the jetting results. These little engines need correct fuel pressure and back pressure to function properly. My problem was obvious to me when I saw the fuel going back towards the tank at idle, and a quick finger over one of the Bisson Pitts mufflers tubes made the fuel go back where it belongs, to the carburetor. If your needle settings are richer than the factory settings, then you most likely have a lack of fuel pressure due to a lack of back pressure in the exhaust. A lack of back pressure alone will make it so you need to run the needles much further out than the norm. These carbs were designed to operate correctly with the stock muffler, which has one small opening. I hear alot of folks complaining about a rich midrange, or a bad transition, but no mention of the muffler their using. If you have a Bisson Pitts muffler for instance, try pluggin one outlet and starting over. If nothing else, at least you'll be able to get your engine to idle well below 2000 rpm. Later today, I'll tell you what else you can acheive. Im not ready to accept the fact that Supertigre, with all the engines that they sell, are selling them with faulty carbs. If I can get mine running correctly, then you can too, and so far, by plugging one side of my exhaust, my engine will idle at 1400 rpm nicely. I'll be working on the rest of the runability issue's today, and post my results later.