26mm vs 22mm Carb

Discussion in 'Whizzer Motorized Bicycles' started by go-rebels, Jan 15, 2009.

  1. go-rebels

    go-rebels Member

    Just curious about the potential benefits, and shortcomings, of switching the stock 22mm carb with one of the 26mm designs...

    A little math shows a potential 40% more airflow, but a bigger carb may not generate enough air speed (vacuum) to pull fuel up the metering circuit at idle or low engine speeds. Maybe it's only use is on a heavily modified bike that allows for for airflow overall (modified head/exhaust manifold/cam, etc.)

    Or maybe it can and results in too much horsepower for the bike to be licensed as a "Moped" in most states.

    Quenton, I'm sure you've done a battery of tests. Can you please share your findings?

  2. go-rebels

    go-rebels Member