something is not plugged in right
there are diodes in the mz electrical system they can cause fits
dave
attached file may help
look here
viewtopic.php?f=3&t=8464&p=44419&hilit=tony+idle#p44419file is part of this post
click on it to make it bigger
and save the whole post an put a copy in your shop manual
the 660 bikes have an electric system you can learn to hate
lot of this also is relavent to the 125 bikes as well
dave
print below attachments for your shop manual i email this info out more than any other files
print them soon when you really need them your printer will be broken or out of paper and ink