Theory of Operation WM 130/170/270
wc_tx000378gb.fm 32
Ignition system
The ignition system is a transistor-controlled
magneto system with the ignition timing set at
23° before top dead center. The magneto con-
sists of an ignition coil (a) and flywheel (b).
The flywheel (which also works as a fan) is
directly mounted on the crankshaft and the
ignition coil is directly mounted on the crank-
case.
Carburetor
The engine is equipped with a horizontal-draft
carburetor. The carburetor setting is calibrated
after careful testing for all-around perfor-
mance.
Air cleaner
The engine uses a dual-element air cleaner —
cover (a), primary dry-type sponge element
(b), and secondary dry-type paper element (c).
Balancer
The balancer cancels unbalanced inertia
forces. The balancer rotates at the same
speed as the crankshaft to effectively reduce
vibration.
Component Illustration Component Description
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