Mazda 1975 Rotary Pickup Workshop Manual page 34

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1A-A-6. Altitude Compensator
a. Ghecking altitude compensator
l. Disconnect the hoses (carburetor -' altitude com-
pensator, altitude compensator - evapo compensator
valve) from the altitude compensator.
2. Start the engine and keep it running at idle speed.
3. Close with the fingers the mouths of the altitude
compensator from which the hoses indicated in the
above procedure I are disconnected.
If the engine speed drops on that occasion' the
altitude compensator is in normal conditions.
Fig. 1A-16 Checking altitude compensator
b. Replacing altitude compensator
1. Disconnect the hoses from ttre altitude compensator.
2. Remove the bolts attaching the altitude compensator
and remove the altitude compensator.
3. Install the altitude compensator by following the
removal procedures in the reverse order.
Fig. 1A-17 Altitude comPensator
1A-A-7.
Evapo Compensator Valve
a. Checking evapo compensator valve
1. Disconnect the hose @ (altitude compensator -
l A : 5
evapo compensator valve) from evapo compensator
valve.
2. Dsconnect the pressure sensing hose leading to
the evapo compensator valve from the
33T" joint.
3. Start the engine and keep it running at idle speed.
4. Close the inlet of the evapo compensator valve
with the fingers and make sure that the engine speed
hardly varies at that time.
5. Connect the hose @ to the evapo compensator valve.
6. Put the mouth on the pressure sensing hose and
blow. Make sure that the engine speed rises up on
that occasion.
Fig. 14-18
Checking evapo compensator valve
b. Replacing evapo compensator valve
1. Dsconnect the hoses from the evapo compensator
valve.
2. Remove the bolts attaching the evapo compensator
valve and remove the evapo compensator valve.
3. Install the evapo compensator valve by following
the removal procedures in the reverse order.
1A-A-8. lgnition Control System
In this item, inspect the operation of each of the
idle switch, choke switch, control unit and retard
switch relating to the ignition control system.
If a trouble is found, check defective parts according
to Par. lA-8. Trouble Check Guide.
Note:
Before this inspection, warm up the engine suf-
ficiently and make sure that the ignition timing is as
specified.
a. Checking ignition control system
(trailing sidel
Manual transmision:
1. Connect a timing light to the high tension cord for
the trailing spark plug of front rotor housing.
2. Start the engine.
3. Gradually drop the engine speed from 4,500 rpm
and make sure that the timing light goes out when
the engine speed drops to 4,000 t 400 rpm.
4. Further drop the engine speed and make sure that
the timing ligfut goes on when the engine speed drops to
1,150 t 100 rpm and is on even when it drops to the
idle speed. Record the engine speed at which the light