Well, you learn something new every day. Pulled this off a 2-stroke website:
Slide cutaway is not in mm as many think.
It is the size of the gap under the slide front in 1/16ths of an inch.
A 2.0 is 0.125" a 2.5 is 0.156"
This is a leftover from Amal which Mikuni took over long ago.
So, your 2.47mm cutaway is about .094", or 3/32", or 1.5/16", which makes it a #1.5
Guess that makes mine 6.0mm, .240", or about 4/16", which makes them #4.0 (actually #3.8)
Slide cutaway is not in mm as many think.
It is the size of the gap under the slide front in 1/16ths of an inch.
A 2.0 is 0.125" a 2.5 is 0.156"
This is a leftover from Amal which Mikuni took over long ago.
So, your 2.47mm cutaway is about .094", or 3/32", or 1.5/16", which makes it a #1.5
Guess that makes mine 6.0mm, .240", or about 4/16", which makes them #4.0 (actually #3.8)
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