Cub Cadet MTD 90 Series - Manual (Page 97)

Exhaust
91
The exhaust system is a frequently overlooked component of an engine. It is important to make sure the muffler
is in good condition and free of debris and/or insects.
NOTE: A blocked muffler will result in poor performance. If a muffler is completely blocked the engine may not
start.
Summer engines
One of the main differences between the summer and the snow engines is the exhaust system. Because of this
they will be addressed separately.
Spark arrestor (if equipped)
A spark arrestor is available as an option on summer
engines.
NOTE: Spark arrestors are an option that are required on
all engines used in California and U.S. national
parks. See Figure 8.1. Inset.
The spark arrestor also serves to keep blockages out of
the exhaust system.
NOTE: Typical blockages include insect nests built during
the dormant season.
The spark arrestor should be checked and/or cleaned
every month. The spark arrestor can be inspected by shin-
ing a flash light into the muffler. See Figure 8.1.
If The spark arrestor needs to be cleaned or replaced:
1. Remove the four screws that retain the muffler shield
using a 10mm wrench and lift it off of the engine.
See Figure 8.2.
2. Remove the spark arrestor retaining screw using a #2
phillips screwdriver. See Figure 8.1.
3. Pry the spark arrestor out of the muffler.
4. The spark arrestor can be:
• Replaced
• Cleaned by mechanical means
• Solvent cleaned
• Burned clean using a butane or propane torch.
5. Install the spark arrestor by following steps 1-3 in
reverse order.
Figure 8.1
Figure 8.2
Muffler shield
CHAPTER 8: EXHAUST