Governor spring and linkage...

[Externet]

Small engines like Briggs Stratton may have a governing linkage for steady rpm on certain applications.

Seen several implementation ways, but my mower has a weak spring paralleled to the rod, both attach to the same points.  How do they work?

Makes not much sense seeing such configuration, but there has to be a detail/reason am missing.  Is it related to avoid speed  'hunting'  or steadyness ?

[The choke has nothing to do with the subject]

 

The rod often runs inside spring.  The anchoring is slightly different here at the right side lever, attaching to apart holes, which may show more logic :

-Images borrowed from the web-

Edited August 3, 2018 by Externet