who knows where i can find a springer front end for my 81?

There is no bolt on solution that I am aware of. I don't think I've ever seen a 400 with a springer front end, but there may be some out there.

You'll probably have to make something work yourself. You might have better luck just searching google in general for custom springer conversions to get an idea of what's involved.
 
The main problem with fitting a different front end is the length of the stem. Most springers are made to fit a Harley length neck. Which is a bit shorter than the XS650 neck.
Searching most of the Chopper sites or our sister site XS650.com for springer forks will give you lots of answers.
Leo
 
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