Author Topic: Excelsior Universal 125cc - Rear Plunger  (Read 784 times)

Offline john.k

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Re: Excelsior Universal 125cc - Rear Plunger
« Reply #45 on: April 17, 2019, 02:03:56 AM »
the picture of the dismantled frame is in Sheldons EMU.......as a 1954 Excelsior Universal..............looking at the pic,I suspect the spring seat is threaded to the rod,and possibly there is a locknut.................however ,from a constructional point of view ,it would be also possible to make the rod two diameter ,and have the spring seat retained by the step between the two diameters......this method needs no thread,but has certain disadvantages...............summing up the evidence..........i would expect the central rod is "jumped up" and the increased diameter threaded for the spring seat.......the spring seat is clearly visible as a discrete unit ,secured to the central rod .

Offline iansoady

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Re: Excelsior Universal 125cc - Rear Plunger
« Reply #46 on: April 17, 2019, 10:40:58 AM »
If it was double diameter then the seat would tend to move on either bump or rebound (depending which side was which). A thread sounds likely, or even a pin through a collar?

I am 90% sure that replacements can be made and I have PM'd the OP with the email of the chap who made a very good job of mine. Let's face it, a 1950s Excelsior would have been made as cheaply as possible so there are unlikely to be fancy solutions in there.
Ian
1952 Norton ES2
1982 Moto Guzzi V50