Seems Frankenstein Trike is making a kit for the XG500/750. Yes you can trike your XG.

Frankenstein Trikes Harley-Davidson Trike Kits

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A 750 trike! ....................... I don't think so! IMHO the bike/engine is way too small!

A buddy of mine said he just saw one of those in Salt Lake and it looked awesome. Would love to see in person.

Not really. same size bikes run sidecar and do it well . Sidecar puts more drag on. I have a 1996 EVO Harley with a side car the does well. When you consider it is a 1340 but weights 780 lbs ( without sidecar) compared to a XG at 470 lbs and 750cc.
You do have to think of things in a different way. To avoid lugging you drop a gear . With the Street that is not a problem . It has a wide operating range in the gears. Dropping to 5th even at highway speeds would not be an issue.
883 Sporty have been trided for years
Even with my old 1996 it is a 5 speed I drop to forth in hard pulls still run 70Plus MPH with no problem.
I have also considered putting a light frame Vilorex on the XG750. Same as this one in style, however this one is a heavy frame. Only reason I went heavy on it was wanted the taller tire.

[url=https://flic.kr/p/RRwans]

One of my local dealers has a trike built on a 400 CC Honda! I'm just thinking that you really have to want a small trike in a bad way to spend that kind of money on it. On the other hand, it looks a lot better than some of the other trike kits that I've seen.

I wouldn't mind pursing that line of thinking on a separate thread. I've thought it would be nice to have the sidecar for the extra luggage space, but also to add stability while riding early and late in the season.

I did some measuring today. I just maybe installing a Vilorex 563 on an XG750

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Now what makes you think that? I had a lot of people tell me the 750 Street could not pull a sidecar. That it would need gearing changes ect. Well it pulls it just fine. 80 mph and still wants to go.
Pulls it better than a 1340 EVO. The 750 Street will handle a Frankenstein Kit.
Never get side tracked by the it can't focus on the how to.

100_2291 by bob smith, on Flickr