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Wayne,
Interesting idea you have here. Good luck with it.
I will throw out my 2 cents worth of advice.
150 miles on pure electric?
Fagettaboutit!
Can a 150 mi. range EV be made? Sure. But, it's gonna take a stupid amount of battery power. And batteries are either expensive or heavy. If you make it heavy, efficiency goes to crap. No matter how efficient everything else is, if you have to drag around a ton of stored electrons, you are screwed.
I think the way to go is keep everything as light and simple as possible. A range of 40 miles will get most folks to work and back. Also, some may have the ability to recharge at work which would help a lot.
As for the ICE part of the equation, you could go the way Ken is with a pure series hybrid configuration. Personally, I think there is a better solution especially with a tadpole layout. You can find used small displacement motorcycles for next to nothing. Why not use one as the rear half of your hybrid. You get an engine, trans and rear suspension/wheel all in one compact package.
I think you will find that doing this is actually cheaper than putting together a series hybrid system.
The CBR 250 might not be quite enough. I would consider a DRZ400 or maybe a KLR650. The larger motors could run higher final drives and might actually be more efficient. And these bikes have been around awhile and are plentiful and cheap, especially the KLR. There are bazillions of these around.
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