McCulloch 250 - COOLING FINS AND SAWDUST GUARD CLEANING; BREAKER POINT AND CONDENSER SERVICE

6. If the spark arrester gasket is damaged, install a new one when
you re-install the spark arrester. Tighten the spark arrester
attaching screws securely.
COOLI NG FI NS AN D SAWDUST GUARD
The cooling fins and sawdust guard (figure 9) must be kept clean or
the chain saw engine will run too hot and be damaged by over-
heating.
1. Remove the fan housing attaching screws (figure 9) and remove
the housing.
2. Clean the sawdust guard with a soft bristle brush and gasoline
or solvent.
3. Scrape all dirt, sawdust and bits of grass and wood from the
cooling fins on the cylinder head (figure 24). Use a thin brush
(with bristles like a bottle brush) soaked in gasoline or solvent
to scrub the fins clean.
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4. When replacing the fan housing on the engine, pull the starter
rope slowly so that the starter can engage the crankshaft. Tighten
the four fan housing screws securely.
BREAKER POINT AND CONDENSER
The breaker pOints are located in a box immediately behind the
flywheel and operate from a camway on the crankshaft. Because
it is necessary to remove the flywheel in order to adjust the pOints
or to change the condenser, most chain saw users will find it easier
to have their authorized McCulloch Dealer check and adjust, or
change the breaker pOints and condenser whenever it becomes nec-
essary. The adjustment of the breaker point gap follows standard
automotive practices.
1. Remove the fan housing attaching screws (figure 9) and the
fan housing.
2. Lock the flywheel by inserting a pin or screw through the
locking hole (figure 18) beneath the crankcase. Turn the flywheel
you can slide the pin or screw into the cutout section of the
flywheel.
3. Remove the flywheel nut (figure25)witha3 / 4-inch (19.05 mm)
socket wrench.
4. Install a flywheel puller on the flywheel (figure 26). The fly-
wheel puller screws must be threaded 1/ 4-20 and long enough to
screw into the flywheel to a depth of 3/ 4 inch (19.05 mm).
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Do not attempt to remove the flywheel unless the
puller screws go into the flywheelfor a full 3/ 4 inch
(19.05 mm) or the threads ofthe screw holes will be
stripped when pressure is applied to the puller.
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