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Old 09-29-2010, 12:04 PM   #1
rockyuk OP
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airhead frame crack -advice?

While cleaning up my frame i found these tabs to be cracked . I cant see that these add anything to the stiffness(haa) of the frame, they carry the exhausts, pillion pegs and the end of the pannier frame.
I dont carry a passenger but do some light touring so i use the panniers.Is it worth the bother of getting these welded?
I found a similar article on another website and the fellow welded them but he had stripped down to the bare frame,.I only have the swingarm off so i cant move the bike, i dont want to strip it right down so it means calling a mobile welder as i cannot weld.
I,m going to get a price for welding them first ,they are only about 25mm long.If i don,t weld them are my exhausts and panniers gonna end up on the floor?

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Old 09-29-2010, 01:07 PM   #2
jackd
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I found some similar gusset cracking on the rear subframe of my GS when I purchased it. I had them welded and no further problems have arisen. The factory puts them there for a reason - I would suggest that you repair yours as well.
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Old 09-29-2010, 02:00 PM   #3
wirewrkr
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believe or not, most airheads do that.
I believe all it takes is a good wonk on the peg/muffler mounting bracket.
which actually happens alot.
I wouldn't stress over getting it welded right away. Of course you should do it eventually, but most airheads running around out there are cracked there, It will be fine for years.
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Old 09-29-2010, 02:28 PM   #4
Max Headroom
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I suspect those brackets crack due to the vibration of the mufflers, combined with the length of their overhang. Almost every frame I've seen has cracked there, but as Wirewrkr said, the cracks don't seem to cause any harm even over a long period of time.

With the bikes I've rebuilt, I've had the cracks welded and then had a small steel plate brazed over the weld to beef up the area. No further problems.

Photo shows the plate brazed in, before trimming it to shape:

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Old 09-29-2010, 03:52 PM   #5
bmwhacker
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Quote:
Originally Posted by wirewrkr
believe or not, most airheads do that.
I believe all it takes is a good wonk on the peg/muffler mounting bracket.
which actually happens alot.
I wouldn't stress over getting it welded right away. Of course you should do it eventually, but most airheads running around out there are cracked there, It will be fine for years.
Robert

I've parted out 6 Airheads in the past couple years. Without fail every one had the same cracks. Tack weld it and watch it crack again , reinforce / weld it if you want to go to the trouble or ignore it and ride onward.
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Old 09-30-2010, 03:54 AM   #6
rockyuk OP
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The welders coming to have a look today if hes got time, his rate was quite reasonable .
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