I have a 1954 RD-16 with the cable operated magneto like yours. I have run it a lot and have never had an issue. I will say that mine does not have the extra piece that yours has for the remote throttle mechanism.
Member Pine Tree Boating Club chapter of AOMCI
"I don't fully understand everything I know."
"There is nothing — absolutely nothing — half so much worth doing as simply messing about in boats." (Kenneth Grahame)