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Old 12-11-2019, 04:48 PM
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Join Date: Jun 2011
Last Online: 12-11-2019 04:48 PM
Location: Paraguay
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Default Carb Sizing Help

When looking at what carb sizes manufacturers usually put on their bikes and the resultant air velocity at max RPM I came up with this chart and then the Excel spreadsheet that calculates your carb air velocity and where in the range of enduro to motocross it falls within. What is curious is how the trend reverses when going below a 125cc engine. That may be in order to try to maximize engine power at low RPM because small engines have so little any way.

Hopefully people analyzing their setup and deciding on what size carb to use may find this helpful. You can download the spreadsheet from my site at 2 Stroke Carburetor Sizing
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