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Louis,
If you were going to fix it, that engine is basically trash,as has been said, you'll need a complete tear-down.
Check all bearings (low oil, they probably are bad), if the crank looks ok, have it checked for true then checked for hidden cracks, check the bearing journals, they probably are toast with no oil.
While it's apart, check out all the transmission gears, sliders, and bearings. You'll probably find a gear or two with teeth missing since that shrapnel went to the trans too.
Check the block for cracks, especially around where you found broken bits.
If all is ok in there. You might be able to get away with rods, rod bearings, crank bearings, pistons, rings, cylinders, new timing chain, new guides(might as well since you are in that deep). If the cams, journals, lobes, and followers all are ok, check the head for warp. If flat, reinstall.
Just the parts you know you'll have to get will probably cost as much or more than a running bike.
I could be fixed...it's just not economically sensible to attemp to do it. If the block is good everything in it can be replaced if needed. It'd just cost more than the new price of the bike to build the engine from spare parts.
Like everyone else said, find a different engine. It will be easier and less expensive in the long run.
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