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Parameters
Barrel diameter, mm
Venturi diameter,mm
Main jet system:
• fuel jet marking*
• air jet marking
Emulsion tube, type
Idling and air correction systems, primary barrel:
• fuel jet marking
• conventional flow,** air jet
Air correction system, secondary barrel:
• conventional flow, fuel jet
• conventional flow, air jet
Full throttle enrichment (econostat):
• conventional flow, fuel jet
Part throttle enrichment (economizer):
• fuel jet marking
• spring compression (9.5 mm length), N
Accelerator pump:
• atomizer marking
• delivery (10 full strokes), cc
• cam marking
Starting clearances***:
• choke valve (clearance Ç), mm
• throttle valve (clearance ë), mm
Diameters,mm:
• crankcase vent drilling
• vacuum advance unit orifice
• needle valve bore
• fuel return orifice to petrol tank
__________________________________________________________________________________
* 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
21073-1107010 CARBURETTOR
Primary barrel
32
24
107.5
150
ZD
39
140
–
–
–
40
14.5±15%
45
14
4
3.0
1.1
1.2
1.2
1.8
0.70
Table 2-2
Secondary barrel
32
24
117.5
135
ZC
–
–
70
140
70
–
–
–
–
–
–
–
47
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