7. CARBURETOR
Item Unit Specifications
Product Name
Engine Type GZ25N
Carburetor
Type Name WYA-1B
Part Number 4810-81001
Carburetor Specification
Main Jet #38.5
Metering Lever Height mm (in.) 1.5 ±0.16 (0.059 ±0.006)
Venturi Bore mm (in.) MIX 9.0 (0.354) AIR 8.0 (0.315)
Choke Bore mm (in.) ø13.2 (ø0.5210)
Valve Opening Pressure kg/cm
2
(psi) 1.0 2.0 (14.2 28.4)
Valve Closing Pressure kg/cm
2
(psi) 0.4 1.4 (5.69 19.91)
Speed
Idling rpm 2800 3200
Clutch engaging rpm 3800 4200
Stall rpm 5650 6150
Operating Speed rpm 6000 10000
No Load Max Speed rpm 10000
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