Hi I am a new member my MZ is 125 ETZ 1987 I have had it from new , I have put it back on the road it as been back on the road for7 years it as only done 6000 miles . The engine just stopped I have done a low compression test that’s ok but I have put new oil seals in I have done cylinder compression test and it was 75 PSI  that is low so I got a over size piston and had it  re-bored to the new piston and it is still 75 PSI . I have put new points condenser spark plug I have put petrol in the spark plug hole and it still will not start . If I do not get back to you for a while I am a week or too off  I have been at this for months. Thanking you Derek