mr.cycleplane
Riding my Motorbike
there is a part-referenced but not shown in the parts list-it is the 127b lost motion washer. this lost motion washer is used as a 'quick dirty fix' when there is excessive wear throughout the morrow. sometimes its the worn shoes or worn/polished clutch pieces or the two pieces in the brake shoe sleeve are worn and no matter how hard you stomp on the brakes-the bike will not stop(or stops poorly). sometimes the hub has excessive wear because of high mileage and the hub may be polished like a mirror inside! the 'lost motion' is when you go from forward to braking and then go back to forward and the travel is like a half a revolution(or greater) of the crank arms. the lost motion washer is made of copper and drops into the empty hub-the hub is then assembled as usual. the soft copper washer sits in the area that the clutch pieces grab-which have thru time-polished that lip inside the hub(sometimes felt as a temporary 'slip'). the washer serves two purposes-give the clutch something to grab and also 'eat up some distance' so as to engage the brakes sooner. this removes about half the 'lost motion' and gives the rider basically a false sense of 'its fixed'(cuts down on the 'travel of the crank')-works for a while but on really worn hubs you need to do more-reach in the pocket for some jingle. i have used these lost motion washers before with limited success on mildly worn hubs and probably just got lucky.
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