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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 6 Days Ago
Beary Beary is offline
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Default Strengthening 73 rear shock structure

I’m wondering if anyone has removed the two supports that are welded to the vertical posts and horizontal shock structure, and strengthen the area differently. I see some ideas to strengthen the shock structure area, but I don’t want to reinvent the wheel if it’s been done.

Beary
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randy3934 randy3934 is offline
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why? do you weigh 400 lbs? hahahaha
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Iron Mike Iron Mike is offline
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The forces stressing that area are coming upward. Most common failure in that area I’ve have seen is mainly caused by getting airborne and bottoming the suspension
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The Doctor71 The Doctor71 is offline
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This doesn't attempt to address your original question. And I won't try.

However, you may or may not be aware of HD Service Bulletin #656 that deals with the 1973 original frame reinforcement issue. Worst case, it may help the next guy that comes across this thread, 6 months from now.

http://sportsterpedia.com/lib/exe/fe...in:tsb0656.pdf
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Quote:
Originally Posted by The Doctor71 View Post
This doesn't attempt to address your original question. So I won't try.

However, you may or may not be aware of HD Service Bulletin #656 that deals with the 1973 original frame reinforcement issue. Worst case, it may help the next guy that comes across this thread, 6 months from now.

http://sportsterpedia.com/lib/exe/fe...in:tsb0656.pdf
Good reply, thanks. I also found the tail light modification of raising the rear fender interesting.

Anyone know why Harley switched away from the cast frame support? The 1973 support before the support fix is a terrible design.

Beary
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It's "New and Improved"! :^)

They saved money of having the forgings made, the new part could be made in house.
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jbradley46 jbradley46 is offline
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I own a 1973 XLCH purchased new and still own it. I am aware of the frame recall mods and mine does not have the flat bar braces added. My dealer offered to perform the modification in 1973 but I opted not to have it done. I keep an eye on the frame in that area and have never seen any evidence of weld cracking. I believe 1973 is the first year without the cast shock mounts. Now this is the first time I have heard of the modification to raise the fender. I myself have experienced tire contact with the tail light socket and have had to repair the wires. Mine is a mix of early 73 and late 73 parts an came that way from the factory. Example early head bolts but late tail light. Bought new by me from Surfside HD Myrtle Beach in May of 1973 while I was at Myrtle

Beach AFB.
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My thought is to weld a cross brace between the vertical post and shock bolt. Then weld a vertical bar from that cross brace to the vertical post.

That would give a little more room to build something for the wiring, relay, and switches.

Beary
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jbradley46 jbradley46 is offline
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Been riding mine for 47 years without any brace, early 1973 bought new. So having said that I don't think it will take much reinforcement. Reason I never added the factory fix, the flat bar straps, was I thought they looked ugly and I never ride two up or stress the frame.
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The frame I used to build my bike had been butchered and abused. I cleaned up the areas where the straps had been cut off. I welded up several improper bolt holes and did what I could to restore integrity. I saw no reason to reinforce the rear shock area. My bike is set up for solo rider only.
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