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To increase flow into the SU's I have:
1. Clipped the end of the split pins which holds the butterfly/disks in place.(Use Loctite to keep the screws from backing out.)
2. Tapered the butterfly/disks' leading and trailing edges to about 1/16". (They are normally about 1/8" thick.)
3. Used "stub stacks" in the K&N filters.
I have been running the carbs with the above mods for about 10 years. The next time I have the carbs apart, I plan on tapering the butterfly's spindle shaft and using countersunk screws to hold them in place. I may also remove half of the spindle(lengthwise).
meb
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