Service Manual

3-8 FUEL SYSTEM
Specifications
Item Standard
Carburetor Specifications:
Make/Type:
FR651V and FS651V Walbro/LMF-23
FR691V and FS691V Walbro/LMF-26
FR730V and FS730V Walbro/LMF-22
FX651V Nikki 621266-A61
FX691V Nikki 621266-A51
FX730V Nikki 621266-A01
Throttle Bore Diameter:
FR and FS Models 30 mm (1.18 in.)
FX Models
26 mm (1.02 in.)
Venturi Diameter:
FR and FS Models 22 mm (0.87 in.)
FX Models
20 mm (0.79 in.)
Main Jet (MJ):
FR and FS Models #124
FX Models L: #110
R: #114
Pilot Jet (PJ):
FR and FS Models #56
FX Models
#60
Pilot Air Screw Turns out (PS) (Idle
Mixture Screw Turns Out):
FR and FS Models 1 1/4 ± 1/2
FX Models 21/2
Float Level Float parallel to carburetor body
Idle Speed: (1)
Low Idle Speed (Carburetor idle rpm) 1 450 r/min (rpm)
Low Idle Speed (Governor idle rpm) 1 550 r/min (rpm)
High Idle Speed 3 600 r/min (rpm)
Air Cleaner:
Type:
FR Models Single stage filtration system
FS and FX Models Dual stage filtration system
Pre-cleaner:
FR Models Paper element
FS Models Foam element
FX Models Paper element
Second-stage cleaner:
FS Models Paper element
FX Models Foam element