Here's an english version of that page
http://mcs86.free.fr/mag/img/kyosho_...P_page_018.jpg
also, here the parts page which shows the spurs gear. If it's a drawing of the actual part, then the spurs it s 48tooth part.
http://mcs86.free.fr/mag/img/kyosho_...P_page_026.jpg
So... internal ratio works out as 4.07 : 1
Not sure that looks right, but it does have small diffs........
full english manual -
http://www.retromodelisme.com/scan_p...ho-page-1.html