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

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Default extra hole in neck web

Just want to check. I'm going to plug the hole nearest the edge of the web.

The hole closest to the center of the web is for the stock coil mount (?).

The third hole by where the tubes intersect I forget what that's for? Can anybody tell me? Must be tank mount by process of elimination?

I have an extra tank mount hole on the backbone and a mysterious hole on the underside of one of the bottom tubes to weld over today too.



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yes, that hole is for the tank mounts
the upper hole in the web is for the coil mount
the other hole was possibly a hole for the wire harness retainer.
make sure the frame does not have water in the tubes. when i mod'd my frame for oil pump removal, the tubes had water in it. also of note, that tubing is shinola, very thin wall welded seam.
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Quote:
Originally Posted by bustert View Post
yes, that hole is for the tank mounts
the upper hole in the web is for the coil mount
the other hole was possibly a hole for the wire harness retainer.
make sure the frame does not have water in the tubes. when i mod'd my frame for oil pump removal, the tubes had water in it. also of note, that tubing is shinola, very thin wall welded seam.
Yes I just found and welded a scab over a 2 x 4 millimeter hole on the underside of one of the bottom tubes. Blew a bigger hole getting it closed, too. Blew a lot of oily, sooty crud out of that tube with compressed air. Was surprised to discover just how thin the tubing is. I have no idea how that tube got a hole in it. It looked like is was manufactured that way.

My seat post tubes were full of rust. Blew them out, scrubbed them with a shotgun brush, and drilled drain holes in them.

So how did you get the water out of those tubes?
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Quote:
Originally Posted by bustert View Post
yes, that hole is for the tank mounts
the upper hole in the web is for the coil mount
the other hole was possibly a hole for the wire harness retainer.
make sure the frame does not have water in the tubes. when i mod'd my frame for oil pump removal, the tubes had water in it. also of note, that tubing is shinola, very thin wall welded seam.
Yeah the water gets in through the hole in the backbone for the wiring harness. Riding it in the rain or leaving it out in the rain. If you stick your finger in the neck casting, you can feel it is hollow and the holes the front down tubes go into will let water right down into the tubes. I just had to rinse my neck out from all the sand blasting I've been doing and poured a lot of black schmutz out of those tubes. I'm going to rinse the tubes out with denatured alcohol next and it should be good. I plan on keeping the bike out of the rain in the future.
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easy enough, i cut the tubing to install a removable spool piece. run some rust killer through the frame to convert it to ferrous phosphate. you can follow with a rust inhibiting paint or seal the tubes, can't rust where there is no oxygen.
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Originally Posted by bustert View Post
easy enough, i cut the tubing to install a removable spool piece. run some rust killer through the frame to convert it to ferrous phosphate. you can follow with a rust inhibiting paint or seal the tubes, can't rust where there is no oxygen.
I do have a gallon of phosphoric acid. Good idea.
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