Kohler K91 Service Manual page 48

PROBLEM
Choke will not fully
open .
Choke shaft
breaks or plate
comes out .
Choke won 't close
when cranking .
· Choke Replacement And Adj ustment
1 . Position the choke unit on the two mounting
screws so that it is slightly loose.
2 . Hold the choke plate i n the wide open position .
3 . Rotate the choke unit clockwise o n the carbu­
retor (viewed from the choke side) with a
slight pressure until it can no longer be ro­
tated .
4 . While holding the choke unit in the above posi­
tion , tig hten the two mounting screws .
NOTE : With engine not running and before any
cranking , the choke plate will be closed 5° to 1 0 °
at a temperature of about 75 ° F . As the tem pera-
6 . 2 2
CAUSES
1 . Choke spring not properly ad-
justed .
2 . Choke shaft fails t o move
freely.
3 . Faulty choke adjustment .
1 . Incorrect ignition timing .
2 . Too much compression .
1 . Faulty lead wires or terminals .
2 . Air cleaner gasket interference
with choke shaft lever (4 . 5
KW only) .
3 . Open circuit i n solenoid wiring .
4 . Fau lty Decision Maker or
ground in Decision Maker.
5. Choke lever lacks sufficient
travel or smooth movement .
SOLUTIONS
1 . Remove spring retainer and
with choke wide open windup
spring 1 1 2 turn .
2 . Install new shaft assembly re-
pair kit .
3 . Adjust choke . *
1 . Time engine as specified and
install new shaft assembly re-
pair kit .
2 . Adjust ACR t o specification
and install new shaft assembly
repair kit .
1 . Change lead wires or replace
choke . *
2 .
Reposition flat of gasket to
provide clearance for choke
shaft lever.
3 . Check continuity with ohmme-
ter between the two solenoid
terminals on the choke unit .
Replace choke if open circuit .
4 . Replace lead to Decision
Maker with a jumper wire to
groun d . If choke functions
properly, replace Decision
Maker.
5 . Manually move the choke
lever until the choke plate is
fully closed . Replace the
choke unit if it does not move
freely.
*
ture decreases the choke plate will close even
more .
5 . Check choke function b y removing the spark
plug lead and cranking the engine . The choke
plate should close a minimum of 45° at tem­
peratures above 75 ° F. The plate will close
more at lower tem peratures .
NOTE : During cranki ng , the choke will remain
closed only 5 to 1 0 seconds , as choke closing
time is controlled by the Decision Maker.
Choke Shaft S pring Adjustment
1 . To adjust the choke spring , hold the plate in
the wide open position . Windup the spring 1 / 2
turn and then place the straight end of the
spring through the hole in the shaft .