I’d guess the choice of Mabuchi motors for the Williams brass Daylight (89) and J (90) was Samhongsa’s when these these engines came out thirty years ago (!). Apparently the same shortcomings inspiring the current thread were noticed by Jerome Williams’ “kids” in Columbia, MD (AKA Andy Edelman, Mike Wolf, et. al.) Andy soon offered an update kit on his own, consisting of a Pittman motor and a new fly-wheel (as I guess the Mabuchi and Pittman shafts were different). Then It developed that Samhongsa used different gender fly-wheel drive shaft couplings between the two locomotives, and Andy hadn’t caught that. He had provided the same gender for both. There was a “What the???” phone call, and Andy eventually shipped a revised fly-wheel (for the J). So I have enjoyed better running with these two Pittman powered locos for three decades now. 
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