-
Tools needed for job (10 mm socket and swivel extension,
flat-
tip screwdriver, 10 & 13 mm wrenches, needle nose pliers,
5
& 6 mm allen wrenches. Flat file may or may not be
needed)
1) Shut fuel off at tank.
(lever swung AWAY from
fuel line fitting)
2) Remove fuel line from carburetor inlet and drain fuel
line.
Parts for installation. Not shown (but included) is a piece
of
new fuel line & clamp for connecting fuel tank to new
carbure-
tor. (note that carb is pictured with new oil bath filter
assy...some carbs do not have this)
Existing components. Muffler has been removed for clarity.
You do not need to remove the muffler for installation, but
it sure is easier to do the work when it is not present.
3) Drain fuel from fuel bowl on Carburetor. Black plastic
bowl has spring loaded push button. Metal bowl has wing
nut/bolt.
ACME AL/ALN Series Engine Carburetor Replacement (points &
condenser engines)
Carbure-
Valve
Cover
Intake Gaskets
Linkage &
Heat Dampening
Illustrated parts list
Feedcock ON
Feedcock OFF
Valve cover breather tube
Valve cover
NOTE: if your engine has Solid State ignition (and already has a
new-style valve cover assy), DISREGARD figure 5 & 11 thru
13
-
5) Remove allen head bolt fastening breather tube to valve
cover assembly with 5mm allen wrench.
6) Remove nuts fastening carburetor to engine. 7) Remove wavy
washers from studs with needle-nose pli-
ers, or, if you are good, your fingers. BE CAREFUL not to
drop washer into opening below on valve cover.
8) Loosen clamp screw holding throttle linkage rod to gover-
nor arm. Slide rod out of clamp to right.
9) Remove old carburetor from engine.
4) Remove air filter assembly (oil-bath assembly shown, or
you may have a rectangular, dry paper filter assembly in-
stead). Drain oil from cup of oil-bath assembly. (old oil
bath
filter will NOT be re-used; the new carb will have a new oil
bath filter.if you have a dry filter, it will be re-used.)
Use a 10mm socket or
wrench for the upper nut
(a swivel extension
helps clear the air inlet
elbow if using a socket).
You are limited to the
wrench for the lower nut.
Throttle linkage rod
Governor arm
-
11) Remove bolts fastening valve cover assembly to engine
block with 10mm socket or wrench.
BE CAREFUL not to drop or allow anything to fall into the
valve chamber while the cover is off!
12) Assemble new valve cover assembly. Stack exterior cover
on top of interior cover with cork gasket between the two.
Slotted end of rubber tube fits into hole on exterior cover.
If the new valve cover assy. hits the upper edge of the
governor
linkage cover, this is where a flat file is employed.you may
have to file a little material away from the governor cover.
10) Remove old intake gasket. (May have to scrape off with
razor.)
External view
of new valve
cover assembly
Internal view of
new valve cover
assembly
13) Install new cover assembly with tab at top and with
breather tube pointing away from the recoil starter.
-
15) Install throttle linkage to carb: Slide anti-chatter
spring
over straight end of linkage rod. Insert curved end of
linkage
rod into inner (larger) hole of throttle shaft arm on
carburetor.
Hook spring to outer (smaller) hole.
16) Install the new carburetor: First, take the straight end
of
the linkage rod and fit it into the hole in the governor arm
clamp. Slide the carburetor over the studs. Install upper nut
on
carb mounting finger-tight for now. The linkage rod MAY be
in a bit of a bind due to the fact that the throttle shaft arm
on
the new carburetor is further out from the engine, and may
not line up with the governor arm as well. If this is the
case,
Remove the linkage rod from the governor arm. Take needle-
nose pliers and twist the top of the governor arm just a bit
so
the hole in the clamp is pointing in-line with the direction
the
throttle shaft arm. Reinsert the throttle rod in the governor
arm
clamp and check for smooth movement. (NOTE: may have to
remove carb from mounting studs to get linkage rod out of /
back into the clamp) When satisfied with linkage, install
wavy
washers and nuts, tighten with 10mm socket or wrench. DO
NOT tighten linkage clamp screw yet.
17) Adjust governor / throttle linkage: Move the governor
arm
all the way to the right by lifting up on the engine
throttle
lever (down at bottom...this is the lever that the throttle
cable is
hooked up to...if the throttle cable is still attached, you
can
achieve this by simply moving the throttle lever on the
handle-
bars to the full throttle position). Then, rotate throttle
shaft
arm to fully open position (rotating Counter-clockwise
looking
at TOP of carb) With components in these positions, tighten
Governor arm clamp screw down on throttle rod. Hook the
loose end of anti-chatter spring to governor arm clamp
screw,
on the threaded part visible below the head.
14) Install new intake gaskets: Sandwich the heat dampening
spacer (engine block-gasket-spacer-gasket) between the gas-
kets. If the studs are long enough, use the spacer included
with the kit. The tip of the stud can be flush with the face
of
the nut when using the spacer. If the studs are too short
(stud
recessed below face of nut when tightened), remove the
spacer
and just use one gasket.
Throttle shaft arm
Throttle shaft arm
Linkage rod
Governor arm clamp
Throttle lever
-
19) Run new fuel line from fuel tank to intake on
carburetor.
Secure with supplied clamps (the hose will fit loosely at
the
carb and tight at the tank, but it will tighten up OK on the
carb with the clamp supplied).
20) Remove cover from NEW oil-bath air filter assembly (if
new carb equipped with one) and fill cup with engine oil
(any clean engine oil up to 15w40 is fine) to the fill line
marked near the bottom. Reinstall air filter assembly cover.
(this is a bit tricky...make sure to line up the tab on the
one
side, or the cover wont sit down right)
18) Remove governor linkage guard (if engine equipped with
one)
with 6mm allen wrench & 13 mm wrench to access governor
spring.
Using needle-nose pliers, move governor spring from the
middle
hole on the governor arm to the outer hole. Reinstall linkage
guard.
Fuel intake nipple
Hook spring in
Outermost hole
(furthest to Right)
NOTES: A. The Red choke control on this new carburetor works
BACKWARD from most push-pull chokes...on this one,
you PUSH IN to choke the engine for starting, and PULL
OUT for the run position.
B. After starting engine, adjust the idle mixture and idle
stop
screws on the new carb for proper operation if needed.
Engine should idle smoothly, and accelerate without much
hesitation. (Idle mixture screw should run about 1.5 to 2
turns out from bottom.)
C. Make sure the nuts or bolts that attach the air filter
assem-
bly to the carb are tight. (the factory pre-assembles the
air
filter / filter mount to the carb, but they are not always
tightened properly)
Idle Mixture
screw
Idle stop
screw