Boxerworks.com

Change of fork legs can be a can of worms. Quite often the yokes have to come as well. As a case in point the R65 vs the R100(the only ones I have looked into). They both have similar rake and trail. However the R65 has the axle runningh trough the centre of the legs, whereas the axle on the R100 is on the front of the leg - there is an inch or so difference in position. This means that if you just changed the legs, then the effective rake and trail will have changed for the bike - whicever way round you do it. This is why the R65 yokes have a different offset to those on the the R100. Unfortunately, that is not the only difference.

You need to be able to measure the Rake and Trail on you bike, understand how any changes to those settings might change your handling, work out what rake/trail the new fork legs will have and understand what it is you want to achieve. If you want to get more confused google "Tony Foale" and stand by for some heavy reading.

The vast majority of "mods" will only address the issues of ergonomics or visual appeal.
Ergos are all about fitting your specific ass to the mc and there will be no accounting for taste ...
As such, these changes must be personally defined.

As Duane so eloquently writes (in his inimitable way), engine and chassis modification
can easily become a hornet's nest that may produce dubious (if not dangerous) results.

Reality, however, CANNOT justify these assumptions:
1. That the antique airhead chassis / drive-train is perfect in every way
2. That the old mc should never be subject to the vagaries of tinkering, or
3. That this sort of tinkering always results in detriment ...
But rather, reality does prove that:
If this tinkering-activity is to be worthwhile,
it cannot be pursued haphazardly.
Goals must first be well defined with a focus of intention
and then accompanied by extensive research, knowledge, and experimentation.

I have a real nice R65 front end if you decide to go that way, Chuey....