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Old 03-01-2010, 06:49 PM
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Cannonfish Cannonfish is offline
Motorized Bicycle Elite Member
Join Date: Apr 2009
Location: Maryland
Posts: 104
Default Airflow-constricting flange inside my carb...

Hi, I was busy doing some port-matching on my air intake tonight, when I looked inside my carb - and I noticed this flange for the first time (the red arrow is pointing to it in the picture below).

After matching the intake manifold to my jug, the narrowest part of the air intake pathway is now definitely this flange inside the carb. The little airway in the middle of this round flange is so small that I wonder if it was even worth my time to port-match the intake manifold...

Is this airway what people are talking about when they mention getting a bigger carb for these engines (I've read about folks upgrading to an "18mm carb", for example)?

Has anyone tried to dremel this flange down to make the airway bigger on the stock carb? Or would that just destroy it?
Attached Images
File Type: jpg InnerCarbFlange.jpg (564.9 KB, 166 views)
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