No. 2 Choke Diaphragm; Choke Diaphragm Operation; Checking Choke Delay Valve Operation; Choke Valve Opening Angle Adjustment - Mazda 1983 RX7 Service Manual

Clearance should be .45-.51" (11.5-13.0 mm).
Fig. 4:

Choke Valve Opening Angle Adjustment

NO. 2 CHOKE DIAPHRAGM

1) Disconnect vacuum sensing tube from No. 2 vacuum
diaphragm. Pull choke lever link out fully and hold in place. Choke
valve should close fully. (Cool bi-metal coil if necessary).
2) Apply more than 19.7 in. Hg to vacuum diaphragm and
measure clearance between choke valve and wall of air horn. Clearance
should be .057-.070" (1.46-1.80 mm).
CHOKE DIAPHRAGM OPERATION (NO. 1 & NO. 2 DIAPHRAGMS)
Remove air cleaner. Start engine and run at idle. Disconnect
both vacuum sensing tubes from No. 1 diaphragm and one from the No. 2
diaphragm. Each diaphragm shaft should move outward from diaphragm.

CHECKING CHOKE DELAY VALVE OPERATION

NOTE: Automatic transmission must be in Neutral.
1) Warm engine to normal operating temperature. Stop engine
and remove air cleaner assembly. Disconnect inner vacuum sensing tube
from choke diaphragm No. 1.
2) Start the engine and run at idle speed. Diaphragm shaft
should move fully inward within 10-20 seconds after reconnecting
vacuum sensing tube to choke diaphragm.
CARBURETOR - NIKKI 4-BBL
Article Text (p. 3)
1983 Mazda RX7
For www.iluvmyrx7.com
Copyright © 1998 Mitchell Repair Information Company, LLC
Sunday, August 26, 2001 05:52PM