Posted by MarkB_MI on November 27, 2008 at 03:58:22 from (66.103.227.71):
In Reply to: Carb ice posted by wallacedw on November 26, 2008 at 12:38:33:
Carburetor ice is a potential problem with any carbureted engine that doesn't have a source of heat. Most older tractors rely on heat from the exhaust manifold to prevent icing. That's why the exhaust and intake manifold is one piece: to allow heat from the exhaust to keep the carb warm. (I'm not familiar with the MH 44, but I assume that's how it is set up.) Since the outside of your carburetor is frosting, it's fair to say that conditions inside the carb are conducive to icing.
If you are experiencing carburetor ice, then the engine should run just fine on startup, then run progressively worse as the ice builds up. This takes several minutes.
Contrary to popular opinion, fuel additives such as alcohol will do little to prevent carb ice. The ice is forming from water in the air, not in the fuel. And it often forms at the entrance to the venturi and (at low speed) around the throttle plate. The main and idle jets deliver fuel downstream of these two respective locations.
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