If you have to do maintenance tasks on your MZ 125 SM Blizzard then it is usually a good idea to possess a Workshop Manual to use as reference should you need to know proven methods to remove a particular part such as the Exhaust and match it again in the correct manner.
MZ 125 SM Blizzard Workshop Manuals gives you specific diagnostic info with regards to your car therefore if something is broken it will help you figure out what the problem is and tips on how to fix it. You will be able to determine if this can be achieved yourself or that the job is too big you can still make a booking for your 125 SM Blizzard right into a nearby mechanic.
MZ 125 SM Blizzard manual