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It is most likely gonna be the cdi inside the motor. Those are famous for going out. It's not a bad change tho. The part is about 250 dollars and you'll need a new gasket and oil. And really that's all.
From my Yamaha days, the shaft is tapered and there is a small half round key that sits in the shaft. This has to be lined up with a rectangular slot inside the 'magneto'. When they line up, the magneto will slide onto the shaft easily until it locks on the taper. Then you just tighten the nut on the end of the shaft to the correct torque. Make the key sit up at the back, and low at the front to make it easier to find. It will sort itself out when it is fully home.