[Dick Boneske]

Many of the end carbs I restore have the airhorn cracked similar to your picture. I apply JB Weld to the surface of the crack and squeeze the airhorn in a vise to force the crack to close. Wipe off the excess JB Weld and leave it in the vise for at least 12 hours.

Or, you can apply heat carefully to the left and right "beams" (since the zinc melts at a low temperature), while squeezing the top in a vise to force it into position. This closes the crack,. You can apply Super Glue when releasing the vise and squeeze the crack tightly shut, wiping off the excess Super Glue and leaving it in the vise for at least 12 hours.

Both these methods have worked for me.. You can buy steel replacements for the air cleaner web if you're not concerned about originality. With the air cleaner in place, the web is not visible.

I have not seen a successful solder or weld done to repair these cracks.