Kohler KT17 Service Manual

SECTION 4- FUEL SYSTEM & GOVERNOR
CARBURETOR
These engines are equipped with a side draft,
adjustable jet carburetor that was properly set at
the factory and should not have to be reset. If black
exhaust smoke is noted, check the air cleaner first
·an apparent "overrich" mixture can actually be
Condition
1. Black, sooty exhaust smoke, engine sluggish.
2. Engine misses and backfires at high speed.
3. Engine starts, sputters and dies under cold weather
starting.
4. Engine runs rough or stalls at idle speed.
To Adjust Carburetor:
Carburetor adjustments should be made only after
engine has warmed up.
1. Stop engine, tum main fuel and idle fuel ad·
justing screws clockwise, until they bottom
lightly.
CAUTION: Adjusting screw ends taper to cri·
tical needle valves which will be
damaged if screws are turned in
forcefully.
2. Preliminary Settings-Main Fuel - (Models
KT17
and KT19) · turn main fuel adjusting
screw counterclockwise 2·112 turns from bot-
tom. (Model KT21) · turn main fuel adjusting
screw counterclockwise 3 turns from bottom.
Idle Fuel - (For all KT models) ·tum idle fuel
adjusting screw counterclockwise 1 to 1-1/4
turns from bottom.
3. Final Setting-Main Fuel - Start and run
engine at half-throttle for 5-10 minutes to warm
up. Turn main fuel adjusting screw clockwise
from
the preliminary setting until speed de·
creases and note position ofthe screw. Now turn
the screw counterclockwise · the engine speed
may first increase, then it will decrease as it is
turned. Note the position of the screw when
engine speed starts to decrease. Set the screw
midway between the two points noted.
19
due to a clogged air cleaner element. If element is
replaced and black smoke continues, or if other
conditions listed in the following table exist, adjust
the carburetor immediately. An incorrect setting
can lead to fouled spark plugs, overheating, ex·
cessive valve wear or other problems.
Possible Cause/Probable Remedy
1. Mixture too rich - readjust main fuel screw.
2. Mixture too lean - readjust main fuel screw.
3. Mixture too lean- turn main fuel adjustment 1/4 turn
counterclockwise.
4. Idle speed too low or improper idle adjustment -
readjust speed then idle fuel screw if needed.
4. Final Setting-Idle Fuel- Allow engine speed
to fall to idle or put throttle in Idle position.
Make adjustment using the same procedure as
Final Setting · Main Fuel in Step 3.
5. Idle Speed Setting-Run engine at half·
throttle for 5-10 minutes to warm up. Allow
engine speed to fall to idle, or put throttle in Idle
position. Set engine speed to 1200 RPM (± 75
RPM) by turning the idle speed screw clockwise
or counterclockwise.
Screw
Main
---Fuel
Screw
Figure 4·1. Carburetor Adjustments

Kohler KT17 Specifications

General

Brand	Kohler
Model	KT17
Category	Engine
Language	English