Welcome to the forum. :welcome: Repair manuals in English are not available for the grey market Yanmars. Your 1301 has a 3T70B engine. Interesting the F-13 has a 3T70B-NK and the F-14 has a 3t70B-N. A repair manual for the closest American sold Yanmar is all that will be available. I do not know what that would be for the 1301 as there are none with that engine model. Hoye or any parts dealer can probably help you with the closest manual.
The parts manual is available and I find it to be very useful.