I would just invest in a proper ATV jack. They are pretty reasonably priced and are invalueable to have if you work on your own machine. I work on my three quads and my friends quads all the time and that's why I have two ATV jacks.
You will find yourself using it a lot for other purposes around the shop too.I used mine to help lower the fuel tank in my Camaro when I installed the lowering springs and it worked like a charm.
I remember the days of using jack stands and floor jacks and ever since they designed these new ATV jacks, I have had one in my garage.
The ones I have are similar to this design with a hydraulic foot pump and this one sells for $99. They have similar models with an air operated hydraulic lift for $139.