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Carburetor coughing

A

Anonymous-0

Well-known Member
Started an H yesterday that had not run for a couple of years. Cleaned the carb and dist cap first, cranked it up and it ran rough and "coughed" or "belched" back thru the air intake. If I put the choke almost full, it ran fairly smooth and didn't do the belching. I adjusted the carb controls, but didn't affect it. Took off the air intake, cleaned, and put it back on. It ran better, but still belched unless the choke is partially on. Ideas on what to do next? Thanks. DH
 
Well you sort of answered it your self when you said it has to be choked to run like it should. Means you missed something in that carb when you had it opened up
 
Sounds like its sucking air from somewhere it shouldn't. Check around where the carb attaches to the manifold and the intake part of the manifold its self.
 
Did you check the points & condenser? After sitting that long, the points probably need cleaned at least. To quote Hal--run a piece of #400 wet or dry paper through the points.
 
(quoted from post at 15:16:43 09/05/10) Started an H yesterday that had not run for a couple of years. Cleaned the carb and dist cap first, cranked it up and it ran rough and "coughed" or "belched" back thru the air intake. If I put the choke almost full, it ran fairly smooth and didn't do the belching. I adjusted the carb controls, but didn't affect it. Took off the air intake, cleaned, and put it back on. It ran better, but still belched unless the choke is partially on. Ideas on what to do next? Thanks. DH
Click to expand...

"Belching" back through the carburetor usually indicates spark plug wires that are crossed, OR some intake valves that are not closing completely.
 
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