Greensmaster Flex 18/21 Page 3 – 5 Engine
Service and Repairs
Cooling System
IMPORTANT: The engine that powers the Flex 18
and Flex 21 is air–cooled. Operating the engine with
dirty or plugged cooling fins or a plugged or dirty b-
lower housing will result in engine overheating and
damage.
1. Park machine on a level surface. Make sure engine
is OFF. Remove spark plug wire from the spark plug.
IMPORTANT: Never clean engine with pressurized
water. Water could enter and contaminate the fuel
system.
2. Clean cooling fins on cylinder and cylinder head. Re-
move engine cylinder shroud from engine for more thor-
ough cleaning (Fig. 2).
3. Clean blower housing of dirt and debris (Fig. 3). Re-
move housing if necessary.
IMPORTANT: Never operate engine without the
blower housing installed. Overheating and engine
damage will result.
4. Make sure blower housing and/or engine cylinder
shroud are installed to the engine if removed.
5. Attach spark plug wire to spark plug.
Figure 2
1. Engine cylinder shroud
1
Figure 3
1. Blower housing 2. Rewind starter
1
2
Ignition Components
Engine ignition component information is included in
Chapter 5 – Electrical System.
Engine
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