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J2 Frame Breakage - at 50mph.. #773983
05/17/19 10:16 am
05/17/19 10:16 am
Joined: Feb 2012
Posts: 170
Lake Macquarie NSW Oz
ChrisX Offline OP
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ChrisX  Offline OP
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Joined: Feb 2012
Posts: 170
Lake Macquarie NSW Oz
The Enfield isn't normally a drama queen, more of a faithful friend, so having the rear frame lug that holds the axle break out at 50mph was something of a departure. The chain staying on the rear sprocket and the wheel dropping into the mudguard were the main reasons it stayed upright I think. 2500 miles of trouble free riding finished with a bang...literally!

I haven't had much of a chance to analyse the damage but it seems repairable. I worked the phone and the the main bolt-on frame rails that start under the engine, incorporate the axle lugs and finish under the saddle are in the mail as we speak. Other parts are generally available. It will live again.

https://www.youtube.com/watch?v=YMaM3d4qi6w

PS the blurry bit in the middle of the vid is where the bike toppled off the side stand which was jammed against a frame rail. All the stand mounts are broken.

Chris

Last edited by ChrisX; 05/17/19 11:08 am.

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Re: J2 Frame Breakage - at 50mph.. [Re: ChrisX] #773996
05/17/19 1:57 pm
05/17/19 1:57 pm
Joined: Feb 2014
Posts: 135
Las Vegas, NV, USA
T
tomoil Offline
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tomoil  Offline
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T

Joined: Feb 2014
Posts: 135
Las Vegas, NV, USA
Glad that all is well with you Chris.

Re: J2 Frame Breakage - at 50mph.. [Re: ChrisX] #774031
05/17/19 7:25 pm
05/17/19 7:25 pm
Joined: Sep 2007
Posts: 1,190
Ottawa, Canada
gREgg-K Offline

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gREgg-K  Offline

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Joined: Sep 2007
Posts: 1,190
Ottawa, Canada
Wow Chris, now that is what we call "Dodging a bullet", though in this case it was a J2.

Glad you escaped unscathed!
.. gREgg


Spyder Integrated Technologies
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Re: J2 Frame Breakage - at 50mph.. [Re: ChrisX] #774041
05/17/19 9:13 pm
05/17/19 9:13 pm
Joined: Aug 2001
Posts: 2,556
Oztralia
R
Rohan Offline
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Rohan  Offline
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R

Joined: Aug 2001
Posts: 2,556
Oztralia
Crikey ! Good you are OK then.

Is your frame powdercoated or painted ?
One of the criticisms of powdercoat is that cracks aren't visible,
and can progress to full breakages before you notice it.
But yours is the 1st I've heard of, regardless.
Always worth a good inspection after the sandblasting.
Although if it rusted from the inside...

Re: J2 Frame Breakage - at 50mph.. [Re: Rohan] #774078
05/18/19 5:05 am
05/18/19 5:05 am
Joined: Feb 2012
Posts: 170
Lake Macquarie NSW Oz
ChrisX Offline OP
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ChrisX  Offline OP
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Joined: Feb 2012
Posts: 170
Lake Macquarie NSW Oz
Rohan,

Yes powdercoated, but a long time before I got hold of it. Maybe late 80s. Who takes particular note of each and every frame lug and joint before rides? I agree with paint you'd stand a better chance of recognising the early stages but it wouldn't be a certainty. As for cause, I've hit some really big holes, plus there's the other few decades of unknown history. I still haven't been into the bike to find out what happened. That will hopefully in the next few days. Also my brother-in-law is also a materials scientist so I might give him the pieces for an opinion. Nobody I called in search of frame rails has heard of it happening before , but a couple of people suspect use with sidecars. Just hunches though, as I said I have no history. Yes I'll be crack testing the replacements!

Thanks for all your regards. It could have ended much worse.

Chris


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Re: J2 Frame Breakage - at 50mph.. [Re: ChrisX] #774084
05/18/19 7:35 am
05/18/19 7:35 am
Joined: Aug 2001
Posts: 2,556
Oztralia
R
Rohan Offline
BritBike Forum member
Rohan  Offline
BritBike Forum member
R

Joined: Aug 2001
Posts: 2,556
Oztralia
This may be more common than we think ?
I've got this frame lug/engine mount, and although the pic shows the wrong end,
it looks like this may be a breakage, rather than someone cutting it off.
(It sits on my desk here as a display.)

https://s22.postimg.cc/xsh4ibehd/Enfield_green_framelug.jpg

This came with some old Enfield stuff, and also included were a few stray bits of frame,
all of which seemed to be cast-offs from previous disasters.
My lugged Norton dommie frames also showed evidences of previous repairs.
There was a reason all-welded frames were eagerly adopted by the motorcycle manufacturing folks ?

Re: J2 Frame Breakage - at 50mph.. [Re: ChrisX] #774089
05/18/19 8:54 am
05/18/19 8:54 am
Joined: Aug 2001
Posts: 7,840
scotland
triton thrasher Online content
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triton thrasher  Online Content
BritBike Forum member

Joined: Aug 2001
Posts: 7,840
scotland
Decades of road potholes could do that to a lug in a rigid frame!

The nearest thing to a preventative measure is to regularly clean the bike with brushes and rags and look at what you’re cleaning.


Amateur Loctite enthusiast.
Re: J2 Frame Breakage - at 50mph.. [Re: triton thrasher] #774364
05/21/19 11:57 am
05/21/19 11:57 am
Joined: Feb 2012
Posts: 170
Lake Macquarie NSW Oz
ChrisX Offline OP
BritBike Forum member
ChrisX  Offline OP
BritBike Forum member

Joined: Feb 2012
Posts: 170
Lake Macquarie NSW Oz
A few pics...

[Linked Image]

[Linked Image]

[Linked Image]

[Linked Image]

And my replacement rails that arrived yesterday...very pleased about finding some pretty quickly.

[Linked Image]


What's this thread?
Re: J2 Frame Breakage - at 50mph.. [Re: ChrisX] #774409
05/21/19 9:12 pm
05/21/19 9:12 pm
Joined: Aug 2001
Posts: 2,556
Oztralia
R
Rohan Offline
BritBike Forum member
Rohan  Offline
BritBike Forum member
R

Joined: Aug 2001
Posts: 2,556
Oztralia
Some (much) rust involved in the break there, isn't there.
Evidence of something long ago...

Good that you found replacements so quickly.
You must have good sources.


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