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@SVOboy:
Thanks for the 50cc offer, but I'm enjoying the challenge of thinking this through. I have looked around, and I think the Baja series of small ATV engines, which are four-cycle engines, would be a great improvement and look like a near-direct mounting fit. So if I give up on the GDi idea, I'll probably go with that.
@some_other_dave:
It's interesting. Theoretically this should be a load simpler. I've only got one cylinder, right? :-)
The problem is that GDi is relatively new in the auto market. In scooters I believe Aprilla's been at it awhile, as have some snow machines. If I could find either a snowmobile wrecker or an Aprilla scooter in my local yard, I might try scavenging some bits.
I'm also concerned about what would happen were I to transfer an injector from a much-bigger-volume cylinder, as I don't have any idea how to figure out the required fuel pressure. The only reference I've encountered said that one's injectors should run roughly 2 bar over cylinder pressure. In my scoot, which compression-tests at 100lbs, that's roughly 130lbs, which seems high.
The injector also has to survive the heat and pressure in the head, and not get clogged up with oil.
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