Page H-6
FUEL SYSTEM
Repair and Service Manual
Read all of Section B and this section before attempting any procedure. Pay particular attention to all Notes, Cautions and Warnings.
B
Do not let the carburetor vent hoses become clogged or
kinked. Engine heat will cause the fuel in the carburetor
bowl to expand and may result in fuel being expelled
from the carburetor if unable to vent through the vent
tubes.
To adjust the belt tension after installing the carburetor, see
starter/generator adjustment instructions in ENGINE section.
Replace carburetor and air box in reverse order of dis-
assembly. Use a new gasket to ensure sealing of carbu-
retor. Tighten hardware to 50 - 70 in. lbs. (6 - 8 Nm)
torque (Ref. Fig. 4 on Page H-4).
FUEL PUMP
The fuel pump is mounted on the vertical seat support
on the passenger side and is operated by crankcase
pressure impulses from the engine. As the pistons
move up in the cylinders, a negative pressure moves
the diaphragm within the fuel pump (Ref. Fig. 7 on Page
H-6). This movement draws fuel from the fuel tank into
the fuel pump chamber. This action also closes the out-
let valve which prevents fuel back flowing from the car-
buretor.
As the pistons move down in the cylinders, a positive
pressure is formed in the crankcase which causes the
diaphragm to move in the opposite direction (away from
the engine). This action forces the inlet valve to close
and the outlet valve to open and supply fuel to the car-
buretor float bowl.
Fuel Pump Replacement
Tool List
Qty. Required
Socket, 7/16", 3/8" drive .............................................. 1
Ratchet, 3/8" drive....................................................... 1
Needle nose pliers ...................................................... 1
Straight blade screwdriver........................................... 1
Fig. 6 Float Adjustment
Fig. 7 Fuel Pump
Do not confuse pulse and fuel lines. Attempting to oper-
ate engine with lines reversed will result in fuel entering
the crankcase and diluting the oil and possible engine
damage.
Float
Side A
Float
Side B
Tang #1
Tang #1
Tang #2
Tang #2
Needle And
Seat
Adjust Float
Side B Slightly
Above Parallel
To Gasket
Surface
Gasket
Surface
Floats Must Be Level
With Each Other
To
Carburetor
To Crankcase
Pulse Fitting
To Fuel
Line Filter
