Electric won't be cheap, particularly at high power ratings like you're thinking of. Most of your cost will be in batteries, though. So, unless you're $$ endowed, or expect to use it daily, I doubt it's worth the cost and effort.
You'll find your 90cc Honda motor will put out more power/speed (though not torque) than a cheap 125cc Chinese motor will, and last longer.
Really, it all comes down to what you want out of it as to what I would recommend you do with it.
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