@Super

That sounds like a crack gear or loose gear within the motor.

-plarnold

ok, yes that may be it as well..
I thought it felt impinged or off somehow with the 3rd internal gear, as they all seem sound. I was hoping they were only in need of lube, Since the Shuppo was quite old but bnib, and was behaving and sounding identical to the Benkei. When I compress the train with even tension to it exterior and undercarriage the clacking decreases and the trains sound about right..I tried adjust their main body screws to no effect as well..the gears seem pristine in excellent condition. I have not opened them or gone any further.. I do appreciate any thoughts or knowledge you may have?