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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 3 Weeks Ago
Slytat Slytat is offline
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Exclamation 1977 ironhead frame modification help

I have a stock 1977 ironhead frame. I want to
Modify the frame a little. The cross members that are welded where the shock is and the rear downtubes/ rear motor mount. Is this just over build by the factory? Can they be removed with out any frame
Twisting?
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They were a factory recall fix at first to keep the frame lugs from bending from too much weight on the rear fender. I guess if you only ever rode solo you might get away with removing them.

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Those braces were added to frames because they were breaking in warranty. The braces were also put into production at that point.

The MoCo had switched from a forging to a formed piece of cold rolled square stock to save $.

Im not sure there was any problem with the earlier forging bending or breaking.

It took them until 79 to complete a redesign. This is my favorite XL frame.
In 79 they went to the triangulated frame which although is not pleasing to the eye was a much stiffer/better frame. This frame design is very similar to the BT rubber mount frame that was still in use many years later.
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Quote:
Originally Posted by ryder rick View Post

It took them until 79 to complete a redesign. This is my favorite XL frame.
In 79 they went to the triangulated frame which although is not pleasing to the eye was a much stiffer/better frame. This frame design is very similar to the BT rubber mount frame that was still in use many years later.
the FXR frame?
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And FLT*

Although they have a more rigid backbone.
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