sorry mikloooo if it have key timing fixed is good
have you cleand points if burnt spark not strong take points out clean contacts with points file if not have points file use a very fine file make both contacts flat smooth shiny put back in set point gap to correct size fly wheel keyed timing is factory set
clean spark plug before putting plug back squirt two stroke fuel down plug hole refit plug motor should now run at least for short burst or keep running
if it wont fire is coil or condencer falt early villers engines always had ploblems with faulty coil
I used to have lots of nos coils condencer but now all sold
maybe coil can be rewound with condencer you can fit one from different engine with close to same value if condencer different shape wont fit in flywheel you can mount condencer out side to engine somewhere
