Your 93 CR125 makes exactly 9.65 HP at the rear wheel.
Oh wait... are we to assume you just took it out of a crate, factory fresh? Or should we assume it's a rat bike? Something in between?
The problem really is the question "What would you say it is? I've got a stock '94 RM250." How on earth could anyone answer that question? If it's got 8,000 hours and running on the stock piston/rings, the answer is simple... "not much".
The only way to get an educated answer is to ask a question with enough info to be answered in an educated way.
I have been curious about the hp of my bike as well, an older 93 yamaha wr. Perhaps there is a website with a hp spreadsheet of older bikes/hp when they were new, stock? Also might be neat to compare the power on new vs old bikes etc.