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