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After working on the 460 and 560 carburetors for years, that one on the 656 was a dream. I would never put a marvel on anything. The one thing that really gets over looked is proper ignition timing and that can make a real spitting sputtering dog out of a good running tractor. You need to have that timed at full throttle. The degree advance is right about 17 degrees at full throttle. I am not sure of the exact figure but that is darn close. So many time them where they sound the best and almost any gasoline engine sounds the best at no load when timing is wayyyyy yy over advanced. If you set the timing right and it doesn't run right, then you can go for carburetor or fuel flow , float setting, incorrect venturi, wrong main jet, wrong nozzle what ever. As for the manifold. Most neglected part of the entire tractor. I got in the habit of taking them apart on every valve job, overhaul job or even major tuneup if problems. They get so choked up with carbon you cannot head the incoming mixture. And, the valve in manifold along with spring half the time don't work. If you take them apart on a regular basis, they come apart like they should. Otherwise, like the Vet said, they are really miserable. BUT, don't forget the gasket. TWO different styles and if you use wrong one you are in deep doo doo. Manifold has to be split when using the good correct one if it had the older style one. Can you say air leaks.
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