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Swingarm J2 ?? #776920 06/20/19 4:50 am
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Rohan Offline OP
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Came across this pic, anyone know what it is ?

Are bolt-up swingarm rear subframes factory, or has someone cobbled this together ?
Gordon May's Enfield bible shows an "army 350" in similar guise, so were more variants made ??

[Linked Image]

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Re: Swingarm J2 ?? [Re: Rohan] #776941 06/20/19 2:50 pm
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Jeez. It's a cobble-up, and a badly-done one at that. I wouldn't trust to ride it - somebody has cut and shut the subframe and made a terrible mess made of the tube just aft of the swingarm mount plate. J2 front frame, sidecar yokes on the forks (look at the space between the headstock and the stanchions), late-type Enfield India swingarm with the reversed axle plates.

The swingarm military 350 in May's book (page 110) I think you are referring to is based on the factory Model G de luxe, aka 350 Clipper. This had a Model G donk and tranny in a modified mid-50's swingarm frame - note special casting lug for mounting the swingarm. Roy Bacon's book Royal Enfield - The Postwar Models has a pic of a properly done swingarm J2 captioned not listed as standard. This is clearly in a slightly different version of the same frame - you can see the swingarm lug quite clearly. I'm only guessing, but I'd reckon it was only an experiment - since the 500 Bullet was already available, what was the market?

Re: Swingarm J2 ?? [Re: Rohan] #776948 06/20/19 4:02 pm
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I’ve never seen anything like that almost upright piece that holds the swing arm pivot.


Amateur Loctite enthusiast.
Re: Swingarm J2 ?? [Re: Rohan] #776985 06/21/19 12:02 pm
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I'd have to agree on a cobble job.
I doubt the factory would have been so sloppy , even on a prototype.
To my eye, the swing arm itself somehow has the appearance of being "newer" looking than the rest of the machine.


Will work for Guinness smile
Re: Swingarm J2 ?? [Re: Rohan] #777011 06/21/19 9:54 pm
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Yes, when you shimmy along along a rough road, its none too comforting
to know there is about no support for those swingarm pivots.

Its hard to see what the factory army G swingarm version has with all the stuff there,
but it doesn't look a whole lot more supported...

The 1957 brochure details the latest version of swingarm setup,
so maybe someone had noted a problem ?
If the rear wheel can steer itself to some degree, this doesn't make for great steering. !

Re: Swingarm J2 ?? [Re: Rohan] #777014 06/21/19 11:11 pm
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Frame Modified by a nearsighted person
To fit an engine bolted tranny ?
[Linked Image]

Re: Swingarm J2 ?? [Re: Rohan] #777027 06/22/19 5:19 am
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Rohan Offline OP
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Curious - neither that model nor pic appears in Gordon May's bible of years/models for 1956.
But it does appear for 1957 as the exact same pic (but with different 'numberplate', RE350),
and is called a Clipper 350, in Olive Green enamel.

You'd have thought that an all iron engine of modest performance would have had its day by then,
but apparently not. Other models had bigger/better brakes by then too.
Swingarm mounts look to have some support, compared to the maroon beastie to the top of this thread.

Re: Swingarm J2 ?? [Re: Rohan] #777041 06/22/19 5:13 pm
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Hitchcocks as an exploded view of a G frame
Showing how it may have looked before
the tranny mounts were cut out ... and a different engine fitted ?
Once the longer engine/tranny was fitted
The swingarm mounts had to be moved ... and frame cobbled back together.
[Linked Image]

[Linked Image]

Re: Swingarm J2 ?? [Re: Rohan] #777064 06/22/19 10:31 pm
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Rohan Offline OP
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An all welded frame, we'd note.

If you study the bike the top of this thread, its evident its a bolt-up (and lugged) frame,
and with frame rails under the engine.
It looks like just the rear subframe has been 'adapted' to take a swingarm,
and cut-n-shut to suit.

A lot of manufacturers did something along those lines when swingarms came along,
but some bracing for the swingarm pivots was on the menu for most.
Nortons in particular come to mind, there is an odd almost pretzel-shape bit that bolts
across the top to assist in this regard, on the single downtube frame.


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