General, Carburetion, Carburetor adjustment – Generac Power Systems NP-40G User Manual
Page 74: Carburetor removal, Disassembly and reassembly
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Section 4.3- CARBURETOR
General
The carburetor Is designed for use with LP gas
in its vapor form. The following specifications
apply:
Carburetor Inlet Diameter____ 1.02 inch f26mm)
Carburetor Outlet Diameter .. 0.78 inch i20mm)
Venturi Diameter......................0.63 Inch (16mm)
Main Jet Diameter
Number..................................370
Measured Size........................0.145 Inch (3.7mm)
Carburetion
Refer to "Gaseous Carburetion" In Section 4.1
(Page 4.1-3).
Carburetor Adjustment
The LP gas carburetor used on NP-30 and NP-40
generator sets is equipped with a fixed Jet and is
non-adjustable.
Carburetor Removal
Refer to Part 3, Section 3.4, Page 3.4-4 for carbu
retor removal procedures.
Disassembly and Reassembly
The carburetor is replaced as an entire assembly.
Disassembly and reassembly Is not required.