Fuel - Kohler L600 Service Manual

FUEL SYSTEMS
GENERAL
.
Carburetor Adjustment: The following procedure covers the initial adjustment of both. up draft and side
draft type carburetors. An idle adjusting needle is provided on the horizontal carburetor even though
engine operates at idle speed only for a brief moment as it comes up to speed after it is started or when
it
slows
after being shut down- the idle adjustment is therefore not critical and can be permanently set
at 2 turns open. The up draft type carburetor does not have an idle adjustment.
CARBURETORS - GASOLINE
Carburetors are adjusted in the factory and readjustment is not normally needed unless plant is
operated at a much higher altitude or if carburetor problems develop after extended usage.
If engine
misses and backfires,
this could indicate carburetor is see too lean.
If black, sooty exhaust smoke is
.
noted and engine is sluggish,
the fuel mixture is probably set too rich.
Do not neglect carburetor prob-
lems for continued operation with improperly adjusted or dirty carburetor can result in overheating,
fouling of spark plugs, excessive valve wear and other problems.
HIGH SPEED
I- THROTTLE LINKAGE
STOP
FUEL
INLET
l-1/2 TURNS OPEN
MAIN FUEL -
2-l/2
TURNS
OPEN
INIir
FUEL
INLET
IDLE FUEL
-2 TURNS
FIGURE 4-7 -- TYPICAL UPDRAFT' CARBURETOR FIGURE 4-2 -- TYPICAL SIDEDRAFT CARBURETOR
STEP 1 -
STEP 2 -
STEP 3 -
STEP 4-0
Stop engine and carefully turn Main Fuel adjustment all the way in (clockwise) until the needle
bottoms lightly-
do not force as this will damage needle or seat.
For preliminary adjustment, turn Main Fuel adjustment out (counterclockwise direction)
2-l/2 turns on side draft carburetor or l-1/2 turns open on up draft carburetor.
Start engine and allow it to warm up to normal operating temperatures.
Place engine under
normal load when- making final adjustment.
For final adjustment, move Main Fuel needle in until engine starts to slow down from too lean
a mixture (note position), then back out until speed increases--continue turning richer until
speed again starts to drop from overrich setting then turn needle back in until it is positioned
about halfway between lean and overrich settings.
Carburetor Reconditioning: If readjustment does not remedy problems attributed to carburetor, car-
buretor
should be dzsassembled and reconditioned. Always use carburetor repair kit for best recon-
ditioning results.
After carburetor is completely disassembled, all metal parts should be cleaned in a
solvent such as alcohol or aketone or commercial cleaner which readily remove gum and carbon deposits.
Blow out all passages with compressed air and replace all gaskets and worn parts. Repair kits contain
essential parts.
Disassembly and reassembly of carburetors is accomplished as follows:
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41 a