Posted by Bob M on April 06, 2013 at 12:55:44 from (67.240.171.136):
In Reply to: Stumped posted by Dan Richardson on April 06, 2013 at 10:18:30:
Dan - If running at partial choke stops the loping, problem is a chronic lean condition. A few common causes:
- leak at the carb to manifold flange - leak at the manifold to head gasket - a plugged carburetor port - especially the idle port in the carb throat by just above the throttle plate - float level set too low - broken idle mixture screw (note turning the screw IN makes the mixture richer) - improperly assembled carburetor
Also do as Bouncer suggests: Check for good fuel flow into the carburetor. Remove the drain plug or cock from the bottom of the bowl - it should flow a solid stream of gas. If gas just dribbles out there's a restriction)
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