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Sounds like a frailed throttle cable, or that it might be rusted or mucked up with something. Would undo it on carb and see if it has full throttle movement on the cable. If you have not done this yourself before best to have it done professionally or do some read up good luck hope this helps
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.