Another option & possible cheaper, is to buy a wrecked single cylinder four stroke engine, prerefably SOHC or DOHC.
Remove a few engine covers & rotate the crank to see what happens, especially the valve gear. Check out the valve adjustment, clutch & primary driver operation etc. Hands on experience is the only real way to learn.
By using a wrecked engine, it should be cheap & you won't need to worry about requiring special tools to remove rotors etc or making a mistake & damaging a component.
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