I think everybody that says HUGE DIFFERENCE is full of it. I have cut the spring and didn't really notice anything special. Then I drilled out the vacuum piston. I don't know if any of this made a real difference but like stated above it didn't hurt.
Take your seat off to get to the top of your carb . Take the 4 screws out of the top (vacuum diaphragm) . Remove it carefully . There is a long spring in there . Count the coils .Start with @ 8 and go from there .( @ an inch).I chopped @ 10 on mine. A little difference ,not much on mine . I did just do a K & N ,hmf utility muffler (w/ a quit core )and a jet .BIG DIFFERENCE ! Pretty easy to do also !! Took @ a hour and a half . Now it will pull the front wheels up and spin the 26 M/L tires on the street in low !!
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