Kohler MAGNUM M18

SECTION 6A
FUEL SYSTEMS AND GOVERNORS
Drill Choke Shaft Bores Using a Drill Press
1. Mount the carburetor body in a drill press vise.
Keep vise slightly loose.
2. Install a 1/4” dia. drill in drill press chuck. Lower
drill (not rotating) through both choke shaft bores;
then tighten vise. This ensures the carburetor
body and drill are perpendicular and in correct
alignment. Refer to Figure 6A-9.
Figure 8A-8. Allgning/Dritling Carburetor Body.
3. Install a 19/64" dia. drill a chuck. Set drill press
speed to a low speed suitable for aluminum.
Feed drill slowly to obtain a good finish to holes.
4. Ream the choke shaft bores to a final size of
5/16". For best results use a piloted 5/16"
reamer.
5. Blow out all metal chips using compressed air.
Thoroughly clean the carburetor body in a carbu-
retor cleaner.
install Choke Shaft Bearings
1. install screws into the tapped holes that enter the
choke shaft bores until the screws bottom lightly.
Refer to Figure 6A-10.
N
Figure 6A-10. Installing Choke Shaft Bushings.
. Coat the outside surface of choke shaft bushings
with Loctite® from kit. Carefully press bushings
into carburetor body using a smooth-jawed vise.
Stop pressing when bushings bottom against
screws,
. Allow Loctite® to “set” for 5-10 minutes then re-
move screws,
. Install new choke shaft in bushings. Rotate shaft
and check for binding.
NOTE: If binding occurs, locate and correct ће
cause before proceeding. Use choke
shaft to align bushings if necessary.
. Remove choke shaft and allow Loctite® to “set”
for an additional 30 minutes before proceeding.
Wipe away all excess Loctite® from bushings and
choke shaft.
6A.9