Code 9 / JP M20 is using 17 tooth speedo gear (3.90)
Code W / KP M20 is using 19 tooth speedo gear (3.23)
Code X / FP M12 is using 19 tooth speedo gear (3.23)
Code J / SP M31 is using {35} tooth speedo gear - with an adapter for 3.36
3.23 must have been it's top limit w/o an adapter
In something I googled up , from here I think , said Code 9 used a 6 tooth gear.
That must have been a typo error.
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