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Carb Flow Comparison

Carb Comparisons based on Engine CC's & RPM

Flow / Area @ RPM


700 Yamaha cc's per minute/area
33 mm = 855 sq.mm x 3 cyl = 2565 @ 8800 rpm = 1201
36 mm = 1017 sq.mm x 3 cyl = 3051 @ 8800 rpm = 1010
38 mm = 1134 sq.mm x 3 cyl = 3405 @ 8800 rpm = 906

700 Polaris
39.5 mm = 1225 sq.mm x 2 cyl = 2450 @ 8100 rpm = 1157

700 Arctic Cat
44 mm = 1520 sq.mm x 2cyl = 3040 @ 8100 rpm = 933

790 Big Bore Cat
44 mm = 1520 sq.mm x 2 cyl = 3040 @ 8100 rpm =1053

790 Big Bore Cat
45 mm = 1590 sq.mm x 2 cyl = 3180 @ 8100 rpm = 1006

906 Union Bay
45.5 mm = 1625 sq.mm x 2 cyl = 3250 @ 8300 rpm = 1029

Notes: Based on ½ engine cc's

Variation = Yamy @ 50% - Cat @ 47.6% for effective stroke.

3% Loss of HP & Air Density for each 1000 ft. of Elevation Above Sea Level

How do you get 15% less dense air (5000' elev.) thru your carbs??
That's why a increase in carb size helps maintain your horsepower for riding above 5000 feet elevation.

This Helps! Open Airbox + Cold Air Intake + Larger Carbs
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