Disassembly and Assembly WM 80 Repair
120 wc_tx000523gb.fm
10.15 Cylinder and Piston Removal
See Graphic: wc_gr002907
The cylinder and cylinder head is of a one-piece design providing easy
access to the cylinder and piston and eliminating the need for a head
gasket.
The cylinder bore is coated with a wear-resistant metal alloy. This
allows heat to dissipate faster than using a cast iron cylinder sleeve.
The lower operating temperature prevents the oil in the fuel/oil mixture
from dissipating as readily, thus improving engine lubrication.
To remove the cylinder and piston, carry out the following procedure:
10.15.1 Disconnect and remove the spark plug from the engine.
10.15.2 Disconnect the fuel line and the throttle cable from the engine.
10.15.3 Remove the muffler, air filter, and carburetor from the engine. Remove
the engine from the machine.
10.15.4 Remove the four M6 screws (b) holding the cylinder to the crankcase
and remove the cylinder.
10.15.5 Remove the retaining rings (c) securing the piston pin (d) to the piston
(e). Push the pin from the piston and remove the piston from the
connecting rod.
10.15.6 Remove the piston rings (f) from the piston. Be careful not to break the
rings or damage the ring’s grooves when removing the rings.
10.15.7 Remove the needle bearing (g) from the connecting rod.
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