Posted by Bob M on April 14, 2013 at 11:12:52 from (67.240.171.136):
In Reply to: Briggs 19 HP OHV posted by Kevin S SC on April 14, 2013 at 10:58:41:
Assuming the governor linkage works freely without any trace of binding the most likely cause is a lean fuel mixture.
With the engine warmed up and running at speed, try SLOWLY pulling the choke closed. If you find a choke setting where the RPM's settle and the engine runs smoothly you've found the problem.
Possible causes:
1 - Vacuum leak between the carburetor and the cylinder head(s). Look for loose attachment screws, bad gaskets, failed O-rings, etc.
2 - Partially clogged fuel metering orifice inside the carburetor
3 - Carb float level is low.
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2 or 3 of course require going inside the carburetor for cleaning/inspection.
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