Jianshe had a JV w/Yamaha. If it isn't as Honda then it may as some Yamaha
That F13 (JS1P54FMI) is a 54*54. JS125-F & JS125-H had such engine. From
https://articulo.mercadolibre.com.ar...ther-motos-_JM we learn something.
http://www.chinariders.net/member.php?u=31660 may knows more as he is from there ...
Anyways
this (change browser to desktop mode if view from mobile device) covers old & new Jianshe-Yamaha 110 underbones.