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This may be of some "tangential" interest.
I've recently been messing with the Keihin, 42.5mm CV carb on my Honda Dominator.
There is a widely accepted procedure for these motors when running a free-flowing filter and exhaust, known as "Dave's carb mods".
In addition to increasing jet sizes and raising the needle, it is recommended that the two holes in the bottom of the slide are drilled out to 5/32 inch (I think they're 1/8 inch as std, but not sure).
There is no mention of a softer spring.
For now though, I've just changed jets and needle positions but left the slide undrilled, so I can't comment personally .... yet.
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