Bolens 131-730A - Manual (Page 16)

To Adjust Carburetor—Turn
clockwise until it just closes.
needle valve
A
CAUTION
Valve may be damaged by turning it
in too far.
Now open needle valve 1 V 2 turns counterclock­
wise. Close idle valve In the same manner and
open 1V2 turns. This initial adjustment will permit
the engine to be started and warmed up prior to
final adjustment. See figure 29.
To make the final adjustment, place governor con­
trol lever in “FAST” position. Turn needle valve in
until engine slows (clockwise—lean mixture).
Then turn it out past smooth operating point (rich
mixture). Now turn needle valve to midpoint be­
tween rich and lean. Next, adjust idle RPM. Rotate
throttle counterclockwise and hold against stop.
Adjust idle speed adjusting screw to obtain 1750
RPM. Holding throttle against idle stop, turn idle
valve in (lean) and out (rich). Set at midpoint be­
tween rich and lean. Re-check idle RPM. Release
throttle. If engine will not accelerate properly, the
carburetor should be readjusted, usually to a
slightly richer mixture.
OFF SEASON STORAGE
If the machine is to be inoperative for a period
longer than 30 days, the following procedures are
recommended:
Working outdoors, drain all fuel from the fuel
tank. Use a clean dry cloth to absorb the small
amount of fuel remaining in the tank, then run
the engine until all fuel in the carburetor is ex­
hausted.
2. Drain all the oil from the crankcase (this
should be done after the engine has been
operated and is still warm) and refill the
crankcase with clean new oil.
Disconnect the spark plug wires and remove
the spark plugs from the cylinders. Pour about
2 or 3 tablespoons of engine oil into each
cylinder, and then turn the engine over several
times to spread out the oil. Replace the spark
plugs but do not connect the wires.
4. Clean the engine and the entire tractor
thoroughly.
CHOKE ADJUSTMENT
Place control lever on equipment In “FAST” (high
speed) position. Loosen control casing clamp
screw B. Move control casing A and wire until
lever D touches choke operating link at C. Tighten
casing clamp screw B. See figure 25.
5. Lubricate all lubrication points and wipe the
entire machine with an oiled rag in order to
protect the surfaces.
6. Battery storage. See page 12.