You seem open-minded, so let me review the arguments that have been
made by the other posters.
a)Mark Olson argued that the ATV jack is superior a scissor jack.
I don't really dispute that, so long as one has a custom jig or
something to secure the bike to the ATV jack. I found out with my
Honda that an ATV jack wouldn't lift it properly (L-R asymmetrical
frame, frame not the lowest piece on the bike).
However a scissor jack works great.
The ability to remove both wheels at one time could be an advantage,
but most motorcycle maintenance is characterized by removing one wheel
at a time.
b)The argument of L-R stability has been made.
A scissor jack is just as stable as a center stand, and even more so
because it has a slightly wider base.
c)The argument of stability problems because the CG shifts when
removing a wheel has been made.
That argument only applies to either an ATV jack or to using two
scissor jacks. With one scissor jack, the jack has to be positioned
between the CG and the wheel being serviced. Removing the wheel still
leaves the CG between the remaining wheel and the scissor jack. Not
an issue.
d)The argument of Front-Back stability has been made (indirectly by
Bob M. I believe).
This is absolutely an issue.
When servicing the front wheel, I wouldn't worry about it too much if
the bike is in gear.
But when servicing the rear wheel, this is definitely a concern. It
is stable, but it wouldn't take a really hard hit.
Most scissor jacks have have outriggers and holes to mount them down
to a concrete floor or other service ... definitely a good idea.
Chocks are a good idea.
If using two scissor jacks, I would definitely bolt them both down to
steel stock or to thick plywood or to thick plywood reinforced with
steel stock. But doing this becomes as much trouble as making a
custom jig for an ATV jack.
e)I made the argument that two scissor jacks properly secured may have
an advantage over an ATV jack.
That is still my position. There is more room to work underneath the
bike.
But a custom welded jig for an ATV jack where you've inserted maybe 6"
of standoff distance might be just as good.
f)The argument was made that torqueing bolts may cause instability. I
pointed out that the torques required to do this would be in the
hundred of foot-pounds, so this isn't a realistic concern.
g)The argument was made that I have no real experience working on
bikes so I don't know what I'm talking about.
This is really a non sequitur argument--no relevance.
This is typically how the folks on this newsgroup behave when they are
frustrated because another poster doesn't agree with them. In full
classic form, they would also typically insinuate that my romantic
partner was a man.
So, my general advice to you ...
1)A scissor jack is just fine for what you're doing. If you want to
be extra-cautious, chock the rear wheel and bolt the jack down. But
it is pretty darned stable in any case.
2)An ATV jack may create more work for you because the jack won't
always work well without making a custom jig, and if you're going to
lift the whole bike (unnecessary), tie-down straps are advised (again,
more work).
3)Every person has to do what they are comfortable with. If the
scissor jack makes you nervous, go with an ATV jack. But why don't
you buy a scissor jack (they are cheap--see the Amazon link in my
earlier post)? You might buy one just to try it out and see if you're
comfortable with it.
A hell of a lot of accidents in this world are caused by coercing
folks to do things that they don't believe are prudent. Do what you
are comfortable with ...
Take care, Dave A.