The Ford Barn - View Single Post - Model a like a spirited colt or a carburetor problem?

verrece · 05-05-2017, 07:27 PM

The problem I have is, when the engine is at idle, it looks like a galloping horse, indepently of the best position of the air idle adjust screw. But above 800 rpm the engine runs properly.
After I disassemble the carburetor, I saw that when the throttle plate (butterfly) is closed (in their rest place), it blocks ups a half of the idle hole in the carburetor throat.
Anyone could tell me if when the Throttle plate is closed , the correct position should block the hole completely? or should leave completely open the idle hole? Or as I have now, it should block half the hole?
Could this “half hole blocks” be the cause of the engine gallop?.
The carburetor passageways were cleaned, I followed the Tom Endy´s article.
Any advice will be appreciated.

05-05-2017, 07:27 PM	#1
verrece Senior Member Join Date: Jul 2010 Location: Buenos Aires, Argentina Posts: 129	Model a like a spirited colt or a carburetor problem? The problem I have is, when the engine is at idle, it looks like a galloping horse, indepently of the best position of the air idle adjust screw. But above 800 rpm the engine runs properly. After I disassemble the carburetor, I saw that when the throttle plate (butterfly) is closed (in their rest place), it blocks ups a half of the idle hole in the carburetor throat. Anyone could tell me if when the Throttle plate is closed , the correct position should block the hole completely? or should leave completely open the idle hole? Or as I have now, it should block half the hole? Could this “half hole blocks” be the cause of the engine gallop?. The carburetor passageways were cleaned, I followed the Tom Endy´s article. Any advice will be appreciated.