Carburetor - Nikki 4-Bbl; Float Level; Float Drop; Float Level Adjustment - Mazda 1983 RX7 Service Manual

ARTICLE BEGINNING
1983 Nikki Carburetors
NIKKI 4-BARREL
Mazda RX7
DESCRIPTION
Carburetor is of 4-barrel, 2-stage design. Primary stage
includes idle system, slow speed circuit, accelerator pump system and
main metering system. In addition, Federal models are equipped with a
sub-zero starting device which admits fluid into the primary stage.
Secondary stage contains secondary vacuum diaphragm
operating system, stepping circuit and main metering system. Choking
is accomplished through a semi-automatic choke. Other features
include a deceleration control system, automatic choke return, hot
start assist, idle compensation and dashpot (manual transmission).
ADJUSTMENTS
NOTE: For all on-vehicle adjustments not covered in this article,
see the appropriate TUNE-UP SERVICE PROCEDURES article.

FLOAT LEVEL

1) Before assembling air horn to main body, adjust float
level. Invert air horn and allow float to hang by its own weight.
2) Measure clearance between float and air horn gasket. See
Fig. 1. Clearance should be .61-.65" (15.5-16.5 mm). If not within
specifications, bend float seat to adjust.
Fig. 1:

Float Level Adjustment

FLOAT DROP

Turn air horn upright and allow float to hang by its own
weight. Measure distance between bottom of float and air horn gasket.
See Fig. 2. Distance should be 1.98-2.02" (50.5-51.5 mm). If not,

CARBURETOR - NIKKI 4-BBL

Article Text
1983 Mazda RX7
For www.iluvmyrx7.com
Copyright © 1998 Mitchell Repair Information Company, LLC
Sunday, August 26, 2001 05:52PM