I had the MVVS 80 SP IRS in my Zero and it flew it with authority on a 3-blade 26x10 prop.
This morning, I pulled it out and am now in the process of replacing it with the MVVS 80 SP with Starter (
http://www.mvvs-australia.com.au/manuals/80start.pdf )
The starter is driven by an MVVS Electric motor and is mounted on the side of the neck of the engine
The Zero with it's open cowling front is a perfect candidate for this setup.
I will try to take some photos and post here