AMF 1970-1971 Series XX User manual

Parts and Service Manual
1970- 1971 Series XX
Part No. 1002473
AMF WESTERN TOOL DIVISION
Parts and Service Department
Whiteford Road, York, Pennsylvania,
17402.717/848 -1177
"AMF INCORPORAT ED

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CONTENTS
TABLE Of CONTENTS
Page
INTRODUCTION ...................................................................... .. ............................................................................
PREDELIVERY INSTRUCTION S .......................................................................................................................... 1
Install Ski Assembly ............................................................................................................................................ 1
Ski Damper Adju st ment ....................................................................................................................................... 2
Install Windshield Assembly .................................................................................................................................. 2
Fuel Mixture Instructions ..................................................................................................................................... 2
Lubrication .......................................................................................................................................................... 3
SER VICE AND REPAIR .......................................................................................................................................... 3
Hood Removal an d Installation ............................................................................................................................ 3
Hood Assembly Repair ......................................................................................................................................... 3
Repl ace Lamp Assembl ies .................................................................................................................................... 4
Steering and Ski Assembly Alignment ................................................................................................................. 4
Steering Damper Adjus tm en t ............................................................................................................................... 4
To Remove Drive Chain ....................................................................................................................................... 4
Drive Ch a in Adjustment .......................................................................................................................................
To Remove Varia bl e-Speed Drive Belt .................................................................................................................
Variable -S peed Drive Belt Adjustment .................................................................................................................
To Remove Drive Clutch .....................................................................................................................................
5
5
6
6
Drive Clutch Alignment ....................................................................................................................................... 6
To Remove Driven Clutch .................................................................................................................................... 7
To Remove Brake Assembly ................................................................................................................................. 7
Brake Adjustment ................................................................................................................................................. 7
To Remove Carburetor .................... .. ..........................................................................._............................. .. ......... 7
Carburetor Adjustments .............................................................................................._........................................ 7
To Remove Fu el Pump ................................................................................................ _... ..................................... 8
To Remove Engine ....... ...... ... .... . ... ......... ....... ................... .. .............................. .... ... ..... _....... .. .............................. 9
To Remove Engine ... ............... .. .... ..... .... ...................... ... ........................................................... .. ... ............. .... .... 9
To Remove Gas Tank .......................................................................................................................................... 10
To Remove Muffler.............................................................................................................................................. 11
To Remove Muffler.............................................................................................................................................. 11
To Remove Exhaust Megaphon es ........................................................................................................................ 11
To Remove Sprocket Seals and Bearings .............................................................................................................. 11
To Remove Drive Sprocket Assembly ................................................................................................................. 11
To Remove Suspension As se mbly ................................................................................. _. ..................................... 12
To Remove Traction Belt .................................................................................................................................... 12
Traction Belt Adjustment .................................................................................................................................... 12
Traction Belt Alignment ...................................................................................................................................... 12
Traction Belt Tension Adjustment .......................................................................................................................
13
Suspension System Adjustment .......................................................................................................................... 13
Spark Plug Replacement ...................................................................................................................................... 13
Wiring Diagrams ................................................................................................................................................... 14
Troubleshooting. ........ ... ... .. .................................................... ... ........................................................................... 14
ILLUSTRATED PARTS LIST .........................................................................................._..................................... 19
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INTRODUCTION
This manual has been pr epared to provide all
authorized AMF Ski-Daddler Dealers, Distribu tor s
and
technicians with the instructions necessary to
service and maintain the 1970/1971 AMF High-
Perf ormance Series XX Ski-Daddler snowmobiles .
IMPORTANT:
The High-Performance Series XX
Ski
-Daddle r snowmobile is not covered by any AMF
warranty either expressed, implied or statutory.
The series classification for each snowmobile is
clearly shown on the left-hand side of the console
contro l panel. The Model Number and Serial Number
are permanently stamped on the nameplate attached
to the rear right-hand side of the main frame as-
sembly. When ordering accessories or replacemen t
parts, always indicate the correct Model Number
and Serial Number as shown on the ' nameplate.
The following list identifies the Ski-Daddler series
classification, corresponding model numbers and
e ngine designation covered in this manual.
SERIES
CLASSI
FICATION
MODEL NUMBER ENGINE
XX-1300 SD15M28A 292
XX-1340 SD15M26A 340
XX-1400 SD15M22B 399
XX-1440 SD15M23B 439
XX-1650 SD18M29A 650
XX -1800 SD18M30B 793
SD15M28A
111 [Manufacturer's engine code number
M =Manual start
Traction belt width in inches
Ski-Daddler
This manual is presented in two sections. The first
secti on, Maintenanc e, provides the instructions
necessary for maintenance and service while the
sec ond section, the Illustrated Parts List is pro-
vided to facilitate the ordering of spare and replace-
ment parts.
The Parts List section also contains a numerical
listing of all items shown in the Illustrated Par ts
List. Thus, if the part number is known but not its
applica tio n, refer to the numerical list. If the part
100 2 -1 73
INTRODUCTION
taSld
number is not known, locate the item on the illus-
tration to obtain the index number keyed to the
applicab le parts list.
If the information in this manual is not applicable to
all models, the exceptions will be noted and the cor-
rec t infor mat ion for the particular model will be
given.
PREDELIVERY IN STRUCTIONS
The 1970/1971 Ski-Daddlers are shipped completely
assembled except for th e windshield assembly and
the ski assembly.
The windshield and ski assemblie s will be found in
the shipping container. Carefully open the container
and immediately inspect the eqUipment for any
damage or missing items. The spindle pads and
locknuts will be found in the plastic bag. The
bushings and screws are installed on the spring
mounting bracket to retain the ski-dam per during
shippi ng.
IMPORTANT:
The owner must retain the Ski-
Daddler Inspection Record, Form No. 4477QA. This
form must be shown to the dealer should any claim
arise for missing or damaged parts.
Install Ski Assembly
• Remove the screw (3, figure 1) and bushing se -
curing the ski-damper to the spring mounting
bracket.
Figure 1

PREDEL I VERY INSTRUCTIONS
• Place the spindle pad (1) in the s pring mounting
bracket with the thicker section and the directional
arrow on the pad pointing forward .
• Secure the ski assembly to the lower end of the
spindle tube assembly by insert i ng the s crew (3) and
bushing through the s ki damper, spring mo untin g
bracket and spindle tube as ill u strated. Apply 30
foot-pounds torque to the locknut (2). Do not o ver-
tighten locknut as ski assembly should flo at fr eely
on the spindle.
NOTE: Be certain to install sk ii s with p iv ot of ski
damper forward and adju s ting n ut to out s id e ofSki-
Daddler as illustrated.
• Repeat procedure for oppos ite s ki .
NOTE:
Properly installed skii s should to e out 0- to
1/ 2- inch at the front end and s hould be symme t ric al
a bout the centerline of the sled. If ne c ess a ry, re f er
to paragraph Steering and Ski As s em bl y Al ign m ent
procedures.
Ski Damper Adjustment
To adjust the sk i damper ass em blies, rem ove the
cotter pin (figure 1) and tig ht en or loo se n th e ad-
ju s ting nut as required to ach iev e t he de sire d
tension. Replace cotter pin and repeat p roc e du re
on oppos ite ski a ss embly.
Install Windshield As sembly
• Disco n nect hood ha rness at the quick d is -
connect.
• Remove hood assembly. Re fer to Hood R em o val
and· Installation procedure.
• Back off the locknut (figu re 2) and r em o ve the
7/8 - inch length screw us ed to se c ur e th e hood
harnes s clip and the end of th e ri ght-h an d moun t ing
st rip to the hood. NO TE: The hood h arness clip,
locknut and 7/8 - inch le ngth sc re w (figu re 2) are
us ed on the 15- inch trac k sleds only.
• Remove the remaining s crews secu ri ng th e
right- and left-hand mounting s tr i ps to th e hood.
Remove the mounting strips.
• Remove the protective pla s tic cover fr om the
windshield. Place the windshield in po s ition on th e
hood
assembly. Replace the mo unting st r ips as
shown in figure 2.
2
MOUN TING
ST RIP.
RH
7/8 -I NCH LONG
ONLY)
WIN DSH IELD TR IM
M OUNTING
STRIP . LH
•
TOE OUT 0- TO 1 /Z - IN CH MAX I MUM
15 -I NCH TRACK SLED SH O WN
Figure 2
• Usin g th e original screws, loosely secure the
mo unting strips and windshield to the hood as s embly
st arting at the center and working to the sides . Be
certain to position the 7/8 - inch l ength screw in the
end position shown in figure 2.
• Engage the en ds of the mounting strips over the
t rim st rip on t he winds h ield and then tighten the
screws , startin g at the sides and working to the
center. Rem o ve the protective _ ~overing from the
mountin g strips. NOTE: Check mounting s tr ips
for
sharp edges or corners . Use a fine - tooth file
to sm ooth any sh arp edges and corners.
• Attach the hood harness clip to the 7/8 - inch
length screw and secure wi th locknut.
• Repla ce the hood assembly.
Fuel Mixture In structions
r- , -W- A- R-N- IN -G-"I
Never fill the gaSOline tank while the
engine is hot. Wipe off any spilled
gasoline b ef o re attempting to start
engine.
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The correct oil-to-ga soline ra ti o is 20: 1 (20 parts
re gular gasoline to 1 p art oil). Too much oil will
ca us e carbon deposits. Too lit tle oil or a poor mix
will cause insufficient l ubri ca tion an d possible
engi ne damage.
IM PO RT ANT: Gasolin e and o il should be mixed at
temp er ature s above ze ro. At temperatures below
ze ro gas and oil mix with di ffi cult y.
Fuels containing additiv es are not rec ommended for
use in Ski-Daddler engines. For mixi ng wit h gaso-
lin e, use Citgo, Rislon e or Kendall o il prepa r ed
excl u sively for use in a ir-cooled, 2-c y cle engines .
IMPORTANT: Some outboard motor o il s contain an
addit i ve that works we ll in outboa rd motors tha t
ope
rate at much lower temp e ratur es because they
ar e water cooled. However, th e addi ti ves may cause
spark plug fouling in the air-cool ed engi nes u sed on
Ski-
Daddler snowmobil e s.
U se a mixture of gasolin e and o il as shown in the
Fuel Mixture Chart. Neve r u se g asoline left over
fr om the summer or previous win ter.
FUEL MIXTURE CHA RT
OIL (Ounces )
o 4 8 12 16 20 24 28 32 36 40
5
4
3
2
/
o
GA S OLINE
(Gallons)
v
/"
/
./
-"
/ V
./
/"
V
./
/ V
./
~
"
./
/
.,
~
u. s. Ga ll on,
I m pe ,;~ 1 Ga l ion, T-
GASOLINE/OIL RATlO- 20 to 1
Mix the gasoline and oil thoroughly in a clean con-
tain er kept for this purpos e only. The best way to
ens ure a good mix is to pou r th e oil into a container
with about one gallon of ga s oline and mix thoroughly.
Then add additional amounts of ga s olin e as shown on
the Fuel Mixture Chart. Fill Ski-D addl er gas t ank
from this separate container of mix ed fue l. Use a
funnel with a
fine-screen s train er when filling th e
tank.
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3
PREDELIVERY INSTRUCTIONS USia
Lubrication
A low-temperature grease must be applied to the
zerk fittings located on the steering spindle tube s;
after apprOximately each 20 hours of use. The chain
case housing must be checked after each 10 hours of
use and No. 2 lithium bearing grease added as
required.
The bearing cup retainers that hold the drive and
idler sprocket seal bearings should be repacked with
No. 2 lithium bearing grease whenever the bearings
are removed during normal maintenance. No.2
li thium b ea ri ng gr ease ma y als o be applie d to the
i nside of the d rive and idler sprocket bearing re-
ta in ers du ring nor mal main ten ance .
Grease may also be applied as required to the wear-
plates and U-strap securing the steering column to
the roll bar.
SERVICE AND REPAIR
Hood Removal and Installation
• To remove the hood and headlight assembly,
disconnect the hood and the sled wiring harness at
the quick-disconnect below the console on the right -
hand
side of the sled. Release the hood latch
assemblies and then remove the hood and headlight
assembly by lifting back section first.
• To install the hood and headlight assembly,
place the hood in position on the sled so that the
forward hood clip and the bottom edge of the hood
engages the clips along the inside edge of the
bumper.
• Engage the left- and right-hand latch assem -
blies and insert safety pins to secure the hood· to
the main frame .
• Connect the wiring harness using the connector
plug located below the console on the right-hand side
of the sled.
Hood Assembly Repair
AMF Fiberglass Repair Kits are available through
your authorized AMF Distributor. For large
re p airs, order AMF Fiberglass Repair Kit No.
1510693.
Smaller repairs can be made with Repair
Kit No. 1510765. Paint all repaired areas on the
hood using AMF -Orange color paint available in
easy-to-use spray container, AMF Part No.
1510828.
Follow the instructions in the kit when
m
aki ng repa i rs.

SERVICE AND REPAIR
Replace Lamp Assemblies (15 -Inch Sleds Only)
Headlight. Tb replace the headlight bulb, raise the
headlight assembly; remove the screws securing the
cover assembly and remove the cover assembly.
Remove the defecti ve bulb and replace with newbulb.
See illustrated parts list for correct replacement
part numbers.
Taillight. Remove taillight l ens to expose the tail-
light bulb. Remove the defective bulb and replace
with a new bulb. See illustrated parts list for cor-
rect replacement part numbers.
Steering and Ski Assembly Alignment
Good steering ability requires that the skis be
properly set and aligned with the sled body when
th e steering handle is placed in the straight-ahead
position. Remove any play in the skis by pulling
the skis toward the center of sled before taking
measurements. To determine that the skis are
properly aligned, measure the distance between the
inside edges of the skis at the front end and at the
rear. Properly aligned skis should toe out 0- to
1/2-inch maximum at the front. Therefore, the
overall measurement at the front end of the skis
should be no more than 1/2-inch greater than at the
rear. If the skis or steering mechanism are not
properly set, adjust as follows:
• Place steering handle in a straight-ahead
position.
• Remove the hood assembly. Refer to Hood
Removal and Installation.
• Remove the bolt (1, figure 3), two spacers (2),
bottom spacer and locknut securing the rod end
bearing (3) to the spindle arm (6).
• Loosen the jam nuts (4) securing both rod end
bearings (3) to the tie rod (5).
NOTE: If both skis need adjustment, repeat pro-
cedure for the opposite ski.
• Move the affected ski into proper alignment and
recheck measuring points to insure that the skis toe
out 0- to 1/2 -inch maximum at the front end and are
in the same orientation with the sled body as shown
in figure 2.
• With skis properly set and steering handle in the
straight-ahead position, rotate tie rod (5, figure 3)
as required to bring rod end bearing (3) in line with
the spindle arm (6).
4
Figure 3
• Secure rod end bearing (3) to spindle arm (6) as
illustrated. Check for proper alignment and then
tighten jam nuts (4) to secure both rod end bearings.
NOTE: If a greater adjustment is required than that
permitted by the steering linkage assembly, it will
be necessary to align the ski by making the adjust-
ment at the spindle tube assembly as follows:
• Remove screw (5, figure 4) and locknut (6) se-
curing spindle tube assembly (7) to spindle arm (8).
• Remove spindle arm (8) and rotate ski and
spindle tube one notch in the required direction;
replace and secure spindle arm to the spindle tube.
Apply 20 foot-pounds torque to the locknut (6).
• Recheck the skis for proper toe out and align-
ment as previously described.
NOTE: Ski-damper adjustment is not normally re-
quired during Ski-alignment procedures. However,
if adjustment is desired, tighten or loosen th e ad-
justing nut shown in figure 1 as required to obtain
the desired tension.
Steering Damper Adjustment
The steering damper assembly (figure 3) is set at
the factory and should require no further adjust-
ments.
To Remove Drive Chain
• Remove the hood assembly. Refer to Hood
Removal and Installation.
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! CAUTION l
Always disconnect spark plug wires
before working on the engine or drive
elements.
• Remove the locknut securing the chain cover top
and remove chain cover top and spacer sleeve.
• Loosen the bolts (1, figure 4) on both cam up-
rights (2) and rotate the cam and shaft (3) as re-
quired to loosen the chain tension. During reassem-
bly, apply 30 foot-pounds torque to the bolt (1).
• Remove the cotter pin, slotted nut and washer
securing the top sprocket to the driven clutch shaft.
Remove the top sprocket and chain together.
• Reassembly is th e reverse of removal. Per -
form drive chain adjustment procedures and add
No. 2 lithium bearing grease as required to the
chain case.
Drive Chain Adjustment
A properly adjusted drive chain (figure 4) should
have a 1/8 - to 1/4-inch slack. Check and adjust
chain as follows:
• Remove the locknut securing the chain cover
top and remove chain cover top and spacer sleeve.
• Rotate the upper sprocket to tension one side of
the chain and then check the opposite side for proper
slack. If adjustment is required, loosen the bolts
(1) securing the cam uprights (2) on each side.
During reassembly, apply 30 foot - pounds torque to
the bolts (1).
• Rotate the cam (3) counterclockwise to tighten
or until the chain is properly tensioned. Hold the
cam in this position while tight ening the cam upright
bolts (1) on each si de. Be certain the lateral align -
ment between the drive clutch and the driven clutch
(4) is maintained while the cam upright bolts are
tightened.
• Recheck chain tension before replacing the
chain cover, top and spacer sleeve.
To Remove Variable -Speed_ Drive Belt
• Remove the drive chain. Refer to paragraph
To Remove Drive Chain.
• Remove the clutch guard assembly.
I002·17l
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~I SERVICE AND REPAIR leSla~
• Loose n the locknut (8, figure 3) and serrated
washer (7). During reassembly, apply 10 foot-
pounds torque to the locknut (8).
• Push the driven clutch toward the drive clutch
to permit removal of the variable-speed drive belt
from the drive clutch. If necessary the drive belt
can be removed from the drive clutch after the
driven clutch is removed from the bearing clamps .
• Remove the locknuts (7, figure 6) securing the
bearing clamps (8) and remove the bearing clamps.
During reassembly, apply 5 foot-pounds torque to
the locknuts (7).
• Lift the driven clutch and drive belt clear of
the brake assembly and remove the variable-speed
drive belt.
• Install replacement drive belt. Use AMF Part
No. 37880 on Models SD15M26A and SD15M28A-
AMF Part No. 37492 on Models SD15M22B and
SDI5M23B; AMF Part No. 34635 on Models SDI8M-
29A and SD18M30B.
NOTE:
Variable-speed drive belt installation pro-
cedures are the reverse of removal except that the
belt must first be placed around the driven clutch
and then around the drive clutch. Afterin s tallation,
perform the drive chain adjustment, variable-speed
belt adjustment and the drive clutch alignment
procedures.
Figure 4

SERVICE AND REPAIR
Variable-Speed Drive Belt Adiustm~nt
Proper tension for a new drive belt should be ob-
tained when the clutch centers are set to the B
dimension shown in figure 5 for the applicable model
snowmobile.
IMPORTANT: Do not use antislip belt dressing.
Belt slippage is a safety feature which prevents
overstressing drive-system components .
• To adjust drive belt tension, loosen the locknut
(8, figure 3) securing the clutch rod tensioner to
the main frame assembly.
NOTE: If the drive belt is wearing unevenly, check
alignment as described in Drive Clutch Alignment
procedures.
• Move the driven clutch (9) in the direction re-
quired to obtain proper belt tension. Hold this posi-
tion while tightening the locknut to secure the clutch
rod tensioner. Be certain the washer (7) and bar
serrations are properly engaged. Apply 10 foot-
pounds torque to the locknut (8).
To Remove Drive Clutch
• Remove the hood assembly. Refer to Hood
Removal and Installation.
! CAUTION !
Always disconnect spark plug wires
before working on the engine or drive
elements.
• Remove the clutch guard assembly.
• Loosen the locknut (8, figure 3) and serrated
washer (7) securing the clutch rod tensioner to the
main frame. During reassembly, apply 10 foot-
pounds torque to the locknut (8).
• Push the driven clutch toward the drive clutch
to permit removal of the variable-speed drive belt
from the drive clutch. If necessary remove belt
after drive clutch is removed from engine.
• To remove the drive clutch, remove the clutch
adapter bolt and washer. If necessary, use a clutch
puller and remove the drive clutch. NOTE: During
reassembly on Models SD15M28A and SD15M26A
only,
apply 50 to 60 foot-pounds torque to the clutch
bolt. All other models require 70 ± 5 foot-pound s
torque.
6
• Reassembly is the reverse of removal. Per-
form variable-speed dri ve belt adjustment and drive
clutch alignment procedure s.
Drive Clutch Alignment
• Remove the hood assembly. Refer to Hood
RemOVal and Installation.
Always disconnect spark plug wir es
before working on the engine or driv e
elements.
• Remove the clutch guard.
• Loosen the engine holddown nuts (figur e 5) se-
curing the engine supports to engine mount straps .
• Place a straightedge on the fixed face of th e
drive clutch and move th e engine until th e offset
between the straightedge and the front and rear
edges of the driven clutch is set to the A dimension
as shown in figure 5. Rotate driv en clutch 90-
degrees and repeat proc e dure.
• Tighten engine holddown nuts and recheck
alignment. Apply 25 foot-pounds torque when
tightening the engine holddown nuts.
A
0. 24
0.24
0.26
0.26
0.26
0.26
B
12·1/2
12-1/2
12·1/2
12·1/2
12·1/2
12·1/2
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(TORQUE)
FT - LB MODEL NO.
55 ±.5 S D15M28A
55.± 5 S D15M26A
70 .± 5 SD15M22B
70 .± 5 SD15M23B
70 .± 5 SD18M29A
70 .± 5 SD18M30B
Figure 5
ENGINE CLUTCH
292 780M
340 780M
399 9·R
439 9·R
650 11·R
793 11·R
HOLDDOWN
NUTS
VIEW 0
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