Theory of Operation WM 130/170/270
wc_tx000378gb.fm 30
Cooling system
The engine uses a forced-air cooling system in
which a cooling fan (which also works as a fly-
wheel) forces cooling air into the cylinder and
cylinder head. Baffles are provided to guide
the flow of the cooling air.
Connecting rod and piston
The connecting rod is a specially heat-treated
aluminum alloy die-casting. Its large and small
ends function as bearings. A splasher built into
the connecting rod lubricates by splashing
engine oil. The piston is an aluminum alloy
casting with grooves for mounting two com-
pression rings and one oil ring.
Camshaft
The cam shaft and the sprocket are made of
special sintered alloy. They are constructed as
a single piece. The camshaft is provided with
intake and exhaust cam, and the decompres-
sion release lever is mounted on the sprocket
shaft and side.
Valve arrangement
The engine has a chain-driven overhead cam
and overhead valve construction. A single cam
performs both intake and exhaust operations.
Exhaust valve (a). Intake valve (b).
Component Illustration Component Description
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