
Table 2-2
21073-1107010 CARBURETTOR
Parameters
Primary barrel
Secondary barrel
Barrel diameter, mm
32
32
Venturi diameter,mm
24
24
Main jet system:
• fuel jet marking*
107.5
117.5
• air jet marking
150
135
Emulsion tube, type
ZD
ZC
Idling and air correction systems, primary barrel:
• fuel jet marking
39
–
• conventional flow,** air jet
140
–
Air correction system, secondary barrel:
• conventional flow, fuel jet
–
70
• conventional flow, air jet
–
140
Full throttle enrichment (econostat):
• conventional flow, fuel jet
–
70
Part throttle enrichment (economizer):
• fuel jet marking
40
–
• spring compression (9.5 mm length), N
14.5±15%
Accelerator pump:
• atomizer marking
45
–
• delivery (10 full strokes), cc
14
–
• cam marking
4
–
Starting clearances***:
• choke valve (clearance Ç), mm
3.0
–
• throttle valve (clearance ë), mm
1.1
–
Diameters,mm:
• crankcase vent drilling
1.2
–
• vacuum advance unit orifice
1.2
• needle valve bore
1.8
• fuel return orifice to petrol tank
0.70
__________________________________________________________________________________
* Jet marking is flow-related. Flow rate is measured with a micrometer, calibrated against the reference jets.
** Conventional flow through the jet is determined against the reference jet under a special procedure; in operation no control is required.
***Starting clearances are as shown in Fig.2-86
47
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