Bad Boy MZ 42 Owner's, Service & Parts Manual page 19

SECTION 2: DRIVE BELT
Shown to the right is the MZ pump belt tensioner.
Tightening the two 3/4˝ jam nuts on the right side will
increase the belt tension.
The tension should be adjusted so that there is
between 50 to 55 lbs. of tension on the belt. This
can be checked with a belt tension gauge as
shown to the right.
PAGE 19