Chapter 8: Exhaust
79
The exhaust system is a frequently overlooked compo-
nent of an engine. It is important to make sure the muf-
fler is in good condition and free of debris and/or
insects.
NOTE: A blocked muffler will result in poor per-
formance. If a muffler is completely blocked the
engine may not start.
The MTD engine uses one of two different mufflers; a
standard muffler covered here or a catalytic converter
muffler that will be covered later in this chapter.
To remove/replace the conventional muffler
1. Remove the muffler cover that is secured to the
cylinder head by removing the two nuts using a
10mm wrench. See Figure 8.1.
Figure 8.1
Remove
these nuts
2. Slide the muffler off of the studs. See Figure 8.2.
NOTE: The muffler gasket extends well beyond
the port, to act as a heat shield and guides cool-
ing air between the muffler and the cylinder.
See Figure 8.3.
NOTE: The exhaust gasket is made of a graph-
ite material. It will stick to the sealing surfaces
when pressure is applied, tearing when pressure
is relieved. The gasket can only be used one
time.
Figure 8.2
Figure 8.3
CHAPTER 8: EXHAUST
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