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J2 Frame Breakage - at 50mph.. #773983 05/17/19 10:16 am
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ChrisX Offline OP
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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
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Glad that all is well with you Chris.

Re: J2 Frame Breakage - at 50mph.. [Re: ChrisX] #774031 05/17/19 7:25 pm
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Wow Chris, now that is what we call "Dodging a bullet", though in this case it was a J2.

Glad you escaped unscathed!
.. gREgg


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Re: J2 Frame Breakage - at 50mph.. [Re: ChrisX] #774041 05/17/19 9:13 pm
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Rohan Offline
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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
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ChrisX Offline OP
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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
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Rohan Offline
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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
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triton thrasher Online Content
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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.


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Re: J2 Frame Breakage - at 50mph.. [Re: triton thrasher] #774364 05/21/19 11:57 am
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ChrisX Offline OP
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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]


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Re: J2 Frame Breakage - at 50mph.. [Re: ChrisX] #774409 05/21/19 9:12 pm
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Rohan Offline
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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.

Re: J2 Frame Breakage - at 50mph.. [Re: ChrisX] #774780 05/26/19 6:02 pm
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I wonder how long the old frame sat outside in the weather before some former owner decided to make a bike out of it?

Re: J2 Frame Breakage - at 50mph.. [Re: ChrisX] #774806 05/27/19 12:00 am
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Rohan Offline
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Yes I wondered that.

I've got several bikes/frames that I suspect that could apply to.
No cracks or breaks or rust dribbles that I can spot.

Don't aircraft (tubular) frames get treated with linseed oil inside the tubes,
to help prevent anything along those lines.
The consequences being a little more drastic...

Re: J2 Frame Breakage - at 50mph.. [Re: Rohan] #774936 05/28/19 11:47 am
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ChrisX Offline OP
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Yep many decades of missing history on most of this older stuff. I’m not sure there’s any practical way for the amateur restorer to detect internal corrosion. Something full of rust pits on the outside might be suspicious but if, as in my case, you weren’t the one to refinish the frame you’ll probably never know.

Maybe we just take heart that it’s mercifully rare for a frame to come undone in that way and carry on enjoying the bike.

Still too busy with life to pull it down and fully check the damage. Maybe over the next week or so I’ll get an opportunity and report back on what I find.

Chris


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