Even that's lopsided. Assuming the idea is purely software (no hardware manufacturing involved), then the vast majority of the actual work is to make the product.

I would not accept a 50/50 split where he "has the idea" and I do the software. I wouldn't even accept a 50/50 split if the Idea Partner also does a little sales and marketing. I would maybe accept 50/50 if the Idea Partner also provided all the capital. Now we're talking...