Welcome to the MZ Riders. Now you don’t say what is happening to the kickstart lever ie. is it in it’s normal position, because if it is staying down then it will be the return spring. Now what I am about to say I don’t have an answer to, but my 77 TS 250/1 now and again (3 times a year) the kickstart lever goes to the bottom without engaging, it’s a bit of a stinker your foot bottoms out and it makes you wince a bit. I just let it return maybe a couple of times and all is ok again till next time it catches me out. The only thing I can think of is the 23 needles may have too much play in them so they jam but as I said not most of the time. Incidently look on U-tube there is a complete engine strip on your model. wish you well Alan.