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Discussion Starter #1
We inherited a 2-bike basket case and are solving it one problem at time. It's a 1980 GL, but the forks appear to be from a CBR 400, best as we can tell. But it looks like they jammed a 1982 GL 500 axle into it (through numerous ebay searches, the axle image is from eBay, images 1 &3).
There was no axle bolt on the bike and we are trying to figure out if it got snapped off inside the forks maybe? When you turn the axle using the wrench face abutting the forks on the inside (circled red in the image of the 1982 axle) both the inside and outside of the bolt in the 2nd image turn. On the far end, it looks bent (image 4). Even hitting it with a hammer will not move it. Do we need to tap this out to remove it? Any other suggestions?
Second question: Will the wheel in the image take a second disc? Looks like it might and the bike came with a two-caliper set up.
Thanks in advance.
Thanks.
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IMG_0320.jpg
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, both the inside
 

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The GL500 forks don't use pinch bolts. The axle attaches with a clamp on each fork leg.
In your first photo, the circled nut and everything to the right are one piece. The axle is installed in the wheel hub and the nut torqued to spec to set the proper spacing. Then the axle is clamped to the forks.
If you intend to use the CB400 forks, you'll need a CB400 axle. If it's not the same diameter, look for wheel bearings with an OD and thickness to match the GL wheel and an ID to match the CB axle. You'll need to machine custom spacers.
If you do use the CB400 forks, merely adding a second disc is the least of your concerns. You'll need discs of the correct diameter and offset to align with the CB400 calipers.
 

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On the '81 and '82 CX500 Customs, the axle pinch bolt aligns with a groove in the axle to retain it. That doesn't appear to be the case in your photos, but it might be worth fully removing the pinch bolts, just in case I'm mistaken.
 

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Now I see what you're dealing with. It appears they may have milled down the special axle nut to fit the CB400 fork. In that case, try holding that nut, and back out the axle with a wrench on the flat faces at the other end. Or are they hidden in the other fork leg?
BTW, do you have the GL500 or CB400 calipers?
 

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Discussion Starter #5
Thanks Randall for putting so much thought into this. Yes, we know those aren't GL forks. The brakes we have do fit those forks and here is a dual disc potentially VFR/CBR wheel in the box, and an axle to match. But we cannot get this one off. If you spin that nut everything spins. We are at the point of pulling the forks off to see if we can slide them off the axle once they are out of the triple tree.
 

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Shop eBay for proper front end. Sounds like trouble to attempt to continue to adapt improper parts,, and unsafe as well.
 
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