Idle Speed And Mixture Specifications; Carburetor Adjusting Screw Locations - Mazda 1983 RX7 Service Manual

speed to specification by turning throttle adjusting screw.
NOTE: Mixture adjustment is not part of normal tune-up procedure
and should not be performed unless carburetor is overhauled
or vehicle fails emissions testing.
Idle Mixture
1) Idle mixture adjustment requires removal of carburetor to
remove limiter cap. Using a hacksaw, cut through limiter cap and
mixture screw 0.4" (10 mm) from cap end. Remove mixture screw and
install new mixture screw.
2) To install new mixture screw, tighten screw lightly and
ensure it is fully seated. Back screw out 3 turns for preliminary
adjustment. Reinstall carburetor with new gaskets and warm engine to
normal operating temperature.
3) To adjust idle mixture, set idle speed to idle set
specification by turning throttle set screw (automatic transmission in
"N"). Set idle speed to highest RPM obtainable by turning mixture
screw. Reset idle speed to idle set specification by turning throttle
screw. See Fig. 4.
4) Turn mixture screw until lean drop specification is
obtained (automatic transmission in "N"). On automatic transmission,
shift transmission to "D" and set idle speed to curb idle
specification by turning throttle screw.
IDLE SPEED & MIXTURE SPECIFICATIONS
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Application
Man. Trans. ........
Auto. Trans. ..
(1) - Transmission in "D".
(2) - Transmission in "N".
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Fig. 4:

Carburetor Adjusting Screw Locations

COLD (FAST) IDLE RPM
TUNE-UP - ROTARY
Article Text (p. 4)
For www.iluvmyrx7.com
Copyright © 1998 Mitchell Repair Information Company, LLC
Sunday, August 26, 2001 05:54PM
Curb Idle RPM
750 .............
(1) 750 .........
1983 Mazda RX7
Idle Set RPM
770 .................
(2) 870 .............
Lean Drop RPM
750
(2) 840