found this cruising around...they have a 34 mm throttle body, but not too sure if it's the same 34 mm as the xz.
http://www.ecotrons.com/Small_Engine_EFI_PNP_kit.html
I like that 400 to 800cc conversion kit but for $700 a kit I'd want a turnkey operation. Would be interesting to see some mechanical whiz come up with an adapter and instructions for the rest of us non-geniuses. BDC
I emailed Matt at ecotrons ages ago about this. His reply...
We don't have a throttle body that is the right size to make 2
together. for this motor.
You may have a better chance to find it from the similar engine which
has been fuel injected.
The only way to make this motor fuel injected (with our kit), is to
make an Y shape intake manifold (your job), which connects a single
throttle body (42 mm TB from us), to 2 cylinders. You will drill 2
holes and weld 2 injector bungs (from us) to the manifolds. and
install 2 injectors there.
the rest of the EFI is flexible to install.
You will need some tuning work . I will help on that.
The total EFI kit for this motor will be $799.