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Trying to get an Ironhead look to the frame, now I have to figure out how to move the shocks forward and still have room for an oil tank and battery. Thinking an old kidney tank hung on the side and remount the stock battery box after relocating the shock mounts.
Hope you post updates as you make progress on this. I've been considering that same thing for my '92 EVO XL. The shock location on those frames has always bothered my eye compared to the proportions of an Iron Head frame.

Bob
 

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I've seen a few Evo Sporty shock relocation pics on one of the Japanese sites. If I can find one, I'll post it cause it looks equally cool.
I saw one on a Japanese blog where the guy mated an Ironhead rear frame section to the front part of an Evo frame. He did a very good job and the look was Ironhead. Even had the side mounted Ironhead oil tank. Wish I had bookmarked it.

Bob
 

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OK...66 Sportster with the straight seat post tubes, pre-electric start.

Centerline of neck to centerline of shock bolt: 30 5/8".

I guess add about 1 1/4" for an electric frame, but that's just a ballpark on my part.
Thanks for the info. To make an Evo frame more closely resemble an Ironhead frame is going to take more than just shortening the "triangles" to move the mounts forward. If you look at an Evo frame, the seat post bends forward above the engine mount in order to get the oil tank and battery behind it. The Ironhead seat post bends rearward about 10º, and the oil tank and battery mount in front of it. Shortening the triangles isn't going to allow enough room behind the seat post for oil tank and battery, and you won't be able to mount them in front of it like an Ironhead unless the seat post is bent rearward. Major surgery. I wish I had a bent/junk Evo frame to use for the development work.

Bob
 

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OK, so I'm partly responsible for getting the thread off track, but it seemed like there wasn't much else to say about the neck gusset. worn, I think the photo you posted is a good example of why the seat post should be angled rearward toward the shock mounts ala Ironhead. There would be room to put the oil tank and battery in front of the seat post. I think a large horseshoe shaped oil tank like the old XLXH tank would look good if a battery could be fitted into one side of it.

Bob
 

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I'm going to finish up the work on the headstock and down tubes I've already started before cutting up the subframe.
Sounds like a plan. If you proceed with the modification, let us in on it. As an option, if I could get my hands on a pre '74 Ironhead frame that was bent or junk, I'd see what it would take to mate the rear half to the Evo frame. Alternately, I wonder if the backbone of an Ironhead frame could be raised to accommodate the Evo powerplant.

Bob
 

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I noticed they put new upper front engine mounts on the frame - I lopped mine off with the gusset just because it was near impossible to work around it. I've been considering just leaving it off, Ironheads didn't have them and Evo Sportsters didn't have them until 2000(?). Also noticed quite a few aftermarket frames don't bother with it. The frame is much skinnier, open and cleaner looking without it.
I doubt you'd need it. Attaching the front cylinder head to the down tubes on the Ironhead frame probably serves to stiffen the frame and prevent steering head flex more than it serves to secure the engine in the frame. That could be important on a bike built for handling performance. Not so much on an ordinary custom.

Bob
 

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You said originally that you were trying to get an Ironhead look for your frame. I have no experience with this but I've seen Evo swingarms on Ironhead frames but how about the other way around? Is that even possible? I've never made a side by side comparison. I'm sure someone else has by now.

Just a thought.
Of course, most anything can be interchanged with modifcations, but for stock swing arm interchanges, here's the deal. You can put a box section swing arm on your pre-'82 Ironhead by using the '79-'81 disk brake swing arm. In '82, the frame changed and none of the '82 and newer swing arms will fit earlier frames.

Bob
 

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Well, there it is! Thanks.
But wait--there's more to the story. If you use the '79-'81 box section swing arm on your' pre-'79 frame, you'll need to address the differences in shock length. Since the box section swing arm has the shock mount much further back than the round section arm, it's going to change the ride height. I didn't bother to mention that in the previous post about interchange because ride height is a personal preference thing, not a real factor in interchangability .

Bob
 

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I think the Japanese site for the guy who changed the back end of his Sportster is this one.......

http://inuchopper.blogspot.com/

Have a look back to around the end of June 2010 to see what he did. You can translate the page using Google's translate facility.

I'd like to do this to my 2000 sporty, but you don't fall across the parts too easily in Normandy!!
That's definitely the look. I tried Google translation and the results in English were practically meaningless. The photos are somewhat self explanatory but I sure would like to be able to read the commentary. Anybody here speak Japanese?

Bob
 

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Looks pretty good. I'm not sure if the builder was trying to replicate an Ironhead frame. If so, he's a liitle off but it still looks better than stock. I like the forward mounted bottom shock mounts on the swing arm.

Bob
 
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