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cut rear frame loop??

 
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Guest






PostPosted: Thu Sep 16, 2004 7:19 am    Post subject: cut rear frame loop?? Reply with quote

I recently looked at a commando that had the rear frame loop (behind the seat/ontop of the mudguard) cut off.
I could'nt tell at first why the bike looked different.
I have read an article on the creator of the Commando frame, and I think I remember them mentioning that this was VERY bad for the safety of the bike, anyone else seen this?
I assume the structural integrity of the bike would be somewhat compromised....but I'm not sure.
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Jason Curtiss



Joined: 14 Jun 2003
Posts: 667
Location: HOUSTON, TEXAS

PostPosted: Thu Sep 16, 2004 7:50 am    Post subject: Reply with quote

Dear Guest,

The missing frame section you mention does not compromise the structural integrity of the bike, per se. It does, however, compromise fender and seat mounting.

Regards,

Jason
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Guest






PostPosted: Thu Sep 16, 2004 4:44 pm    Post subject: Reply with quote

Oops, sorry..thought I was logged in.

Well, that makes me rethink a few things on my bike. I've never liked the odd outreach of the rear loop but always thought it would cause some sort of weakness in the frame.
I tried using a humped racing seat from RGM to offset the long looking rear of the bike once clipons were installed, and was currently looking at a Norvil set up with seat/tank witch I really like. Now trimming the rear of the frame might be an option as well.

Thanks for the info Jason
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Markus Derailius



Joined: 02 Sep 2004
Posts: 6
Location: Houston, TEXAS

PostPosted: Thu Sep 16, 2004 4:46 pm    Post subject: Reply with quote

WThell?...I guess NOW I'm logged in. Rolling Eyes
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outlaw1875



Joined: 30 Oct 2003
Posts: 28
Location: Phoenix, Arizona

PostPosted: Thu Sep 16, 2004 5:28 pm    Post subject: cut rear frame loop Reply with quote

A previous owner had cut off the rear frame loop on my 72 combat approximately where the back of the seat ends. He then made a 1/4 inch thick by 1 1/4 inch wide horseshoe shaped metal bracket with the bracket ears welded to the inside of the remaining loop tubes near their cut ends. the bracket curves up over the rear fender then down to the other loop tube. he then drilled a hole through the bracket and fender and and secured them together with a nut/bolt/ lockwasher. He bobbed the fender and put on a small custom combo tail light/license holder. the fender is really stable, but remember that this one has about 1/3rd of its original length cut off. he found some rubber plugs to close off the openings in the remaining frame tubes. HTH
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Chris Barrett



Joined: 23 May 2003
Posts: 36
Location: Chicago

PostPosted: Thu Sep 16, 2004 6:11 pm    Post subject: Reply with quote

Frame loops often break right behind the shock mounts when heavy luggage is carried aft. My original frame had this happen and a really nasty repair made. Now that I have a spare engine, I think I'm gonna use that frame and cut off the tail loop as part of my Mad Max track bike.

-Chris
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Niels



Joined: 06 Aug 2004
Posts: 14
Location: Aarhus, Denmark

PostPosted: Sat Sep 18, 2004 3:26 am    Post subject: cut rear frame loop?? Reply with quote

I’ve had the same thoughts as you Markus; trimming the rear loop and “cleaning” up the hole “rear light / turn signal / license plate holder” assembly, but would probably not start cutting up my frame, if I didn’t have a pretty good idea of how the final result would look like. So…, if anybody out there should have a photo lying around of a Commando with a cut off rear loop / custom made tail light section, please share it with us.. Surprised

/ Niels
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Markus Derailius



Joined: 02 Sep 2004
Posts: 6
Location: Houston, TEXAS

PostPosted: Sat Sep 18, 2004 7:44 pm    Post subject: Reply with quote

Thanks guys-
I guess It wouldn't be such a big deal, and like I mentioned before, I like the look.
But like you Neils, I don't think I'm ready to start chopping up my frame just yet. I'm probably going with the Norvil style that extends to the rear and covers up that space.....for now at least.

-Mark
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nortonfan



Joined: 24 Dec 2003
Posts: 362
Location: Brisbane, Australia

PostPosted: Sun Sep 19, 2004 1:58 am    Post subject: Reply with quote

Mark,

If you go to the this link....

http://users.bigpond.net.au/nortonfan/photo.htm

You will see where one norton I brought home had come "customising" done to the rear of the frame. Just thought that the photo might give you some idea on how to tackle your frame. We reckon the PO must have had a large pillion passenger to carry possibly ?

Reg.
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The Unapproachable Norton Commando

At the end of 1967 the Norton Commando was announced.

The Norton Commando was greeted with a certain amount of scepticism because on first sight the commando appeared to comprise of the old Norton Dominator twin cylinder engine mounted at an inclined angle in a set of new cylinder parts.

It was not realized that the new Norton Commando Isolastic method of engine suspension damped out all engine vibration and produced a machine which had uncanny smoothness for a vertical twin. In due course the critics were silenced and the Norton Commando had the distinction of being regarded as the first of todays so called superbikes. There can be little doubt that the original design concept of the Norton Commando has proved correct, since comparatively few modifications of any real consequence have been made since production commenced during 1968.

Now nearly 40 years later Norton Commando riders like us are a breed of our own, and as far as we are concerned its still more fun to go for a blat on the old Norton Commando, and fast. As a Norton Commando owner and enthusiast, my goal here is to promote and give credit to those who keep the Norton name going.

It is more deserving to give credit to the Commando itself, for after all these years it continues to be respected. The original Commando designers like John Favill are those who deserve the credit for developing this incredible motorcycle.

The Norton Commando Roadster and Interstate of the late seventies, never died. Although the Norton Villiers factory dispersed the tradition lived on. Today Kenny Dreer in the USA is developing the new 952 CC Norton. What a great looking bike this is, and its engineering is still based on the original layout. It will be interesting to see how the new 952CC Norton does in todays tough motorcycle market. One thing is for sure, I would own one if I could afford it.