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Wow.  I had no idea that thing was inside there!  Good catch and thanks for the tip!


[ATTACH=full]520878[/ATTACH]



Out it goes.  And back to the bench I go.




Here's the quick results (corrected flow data).


Carb + air filter, with black insert = 17.2 CFM

Carb + Air Filter, without black insert = 18.4 CFM


The black insert costs you 1.2 CFM!


Carb + air filter + orange filter cover with black insert = 16.8

Carb + air filter + orange filter cover without black insert = 17.6



So installed on the saw you gain back .8 CFM (the cover still has a detrimental effect)


I retested the carb+filter_cover with insert to compare to last night and I am within 0.1 CFM so the tests repeat well.



I am definitely removing that part from inside my air filter!   I will likely machine a spacer for the stud to prevent collapsing the air filter when I tighten the cover.


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