Troy-Bilt 78 Benutzerhandbuch

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.

One of the main differences between the summer and the snow engines is the exhaust system. Because of this 

they will be addressed separately.

     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.

Muffler shield

For Parts Call 606-678-9623 or 606-561-4983

www.mymowerparts.com