BOMBARDIER ski-doo BLIZZARD 298 1981 User manual

00,000. more money for racers
who ride Ski-Doo machines
... atotal
of up to a ml;,r-tAr of a million dollars to
be won season ... more sponsored
.. . This is
of the new rac-
ing program by the Ski-Doo
division of Bombardier Limited.
last year the company came up with a
50,000. incentive program for 29
races in Canada and the U.S. This year
the offers more money, and in-
cIudes races,
The incentives are asfollows: in the mod-
ified classes $300. and $100. for
second and third in the stock
classes 50. and . and in
durance races the 1st
'Ill ,;:1\1'.)., 3rd
The 'vVill be presented by the Ski-
Doo distributor, in whose the
sponsored racesare held.
At a "",.,,,,o,..,,-,,,ri mestino. the program en-
try form which classes
are e! money. The
entry are available from the race-
organizers' reoistration offices.
The to the Ski-
Doo Team. anyone
of our track stars come in second
or the money goesto the Ski-
Doo snowmobile rider who comes in first.
second or
third after them. In other
words,
if the team wins an endur-
ance race, and an individual Ski-Doo
snowmobile owner finishes the
'-ilL,V,.)'..}. goes to the individual and not to
the team.
In order to protect the winning !~ii(lii,ili;t\f
of racers. this
valid for the Bombardier Limited Racing
Team Personnel and families
of Bombar-
dier Limited.

CONTROLS/INSTRUMENTS 1
FUEL MIXING 2
BREAK-IN PERIOD 3
STARTING PROCEDURE 3
LUBRICATION .4,5,6
MAINTENANCE 7,8,9,10,11
SPECIFICATIONS .12
Throttle Lever (A)
Manual
Starter <8>
Brake Lever (C)
When applied activates the hydraulic disc
system bringing the vehicle to a fast
smooth stop.
Warning: It is strongly recommended that
you familiarize yourself with the positive
braking action of this system.
Kill Button (D)
To stop engine for any given reason, mere-
ly depress button. Wearing the emergency
bracelet
with its pin inserted into the kill
button at the ON (depressed) position
ensures engine
cut-out should you un-
voluntarily leave the vehicle.
Reinserting the pin will complete the
electric
circuit and al!ow the engine to
restart.
Warning: If the button has been used in an
emergency situation,
the source of mal-
function should be determined and cor-
rected before restarting engine.
Tachometer IE)
Standard equipment on all models.
Registers magneto impulse. Direct-reading
dial indicates, in thousands, the number
of revolutions per minute, R.P.lVl.,
of the
engine.

2
Gasoline.
The correct gasoline for you r 81 Izzard
snowmobile is premium gasoline, (not less
than 98 octane).
Oil.
Use only Blizzard oil available at your
Ski-Doo dealer. This oil type has an es-
pecially
formulated oil base to meet the
lubrication requirements of the Bomber-
dier-Rotax engine. (If Blizzard oil is un-
available/ concentrated Ski-Doc oil can be
used.)
Caution: The carburetors of the 1973
Ski-Doo snowmobile have been calibrated
for a mixture of gasoline and concentrated
Blizzard
011. Unless absolutely necessary,
do
not use regular snowmobile oil, If such
011 is used,observe instructions on
the container. Never use outboard or
mineral oils.
Fue! Mixing Ratio.
The correct fuel mixture ratio is
3 3i4 U.S. gallons or 3 Imperial
premium gasoline pius 1 pint
concentrated Blizzard oil, 16 ounces '"
correct fuel mixture.
Caution: To facilitate fuel mixing oil
should be kept at room temperature.
Fuel Mixing Procedure.
To mix the gasoline and oil always use a
separate clean container. Never mix di-
rectly in 'Your snowmobile tank.
Warning: Gasoline isflammable and explo-
sive under certain conditions. Store in a
weI! ventilated area. Always stop the en-
gine and do
not smoke or allow open
flames or sparks near the vehicle when
refuelling.
If gasoline fumes are noticed
while the cause should be deter-
mined and corrected
without delay.
Pour approximately one gallon of
gasoline into a separate, clean container.
Add the full amount of concentrated
Blizzard oil. Shake the container
thoroughly then add the remainder of the
gasoline. Once again, thoroughly agitate
the container.
Using a funnel
with a fine mesh screen to
prevent the entry of water and
transfer the mixture from
container into the snowmobile tank.

With BiIzzard snowmobileengines, a break-
in period is required before running the
vehicle at full
throttle.
Manufacturer's recommendation for the
Bombardier-Rotax engine is 2
to 5 oper-
ating hours. During
this period, maximum
throttle should not exceed 3/4. However,
while cruising, brief full throttle acceler-
ations
contribute to a good break-in. Con-
tinued 'wide ooen
throttle accelerations
can be detrimental. Never let
your engine
overheat.
Note: Horsepower loss can be attributed
to incorrect or lack of a break-in period.
After first three hours of vehicle operation,
the eng!ne head nuts should be torqued
to 16-18
ft/lbs with engine cold.
Warning: Never rim engine at high RP.M.
when the track of the vehicle is raised off
the ground.
1. Using a bottle containing pre-
mixed gas and
oil, inject two or three
squirts
into carburetor throats. (The choke
butterfly hasbeen removed to increase air
breathing).
2. Test
throttle lever operation. if the
lever does
not return , remove
cable
and/or housi ng and replace.
Warning: Do not start the until
throttle lever returns sWiftly.
3. throttle lever slightly.
4. rasp manual starter handle and
pu!1 slowly until a resistance is felt then
vigorously and engine
wil! start. Do
not Istarting rope to its fullest extent.
Allow handle to return s!owly to its orig-
inal
if does not start,
repeat
5.
Allow the engine to warm up before
operating at
full throttle.
Flooding
Feeding an excessive amount of fuel
mixture into the engine will make it dif-
ficult to start. Flooding characteristics are
easily detectable by fuel moisture
dripping
from the carburetors, or wet plug
faces.
if engine has flooded,depress throt-
tle lever and continue starting pro-
cedure. Release
throttle lever immediately
after engine starts.
3

4.
Code
L1
L2
L3
L4
Code
L5
Weekly
Rotary Valve System
Steering Mechanism
Chaincase Oil Level
Driven Pulley
Hvdraulic Disc Brake
5
5
5
6
Page
Pulley Guard Removal
Tilt or remove cab, lout upper retain-
ing cIip and remove wing
nut. Tilt
guard forward. To remove
remove
front and dissnqaqe
pin from bracket.
W.~rl1lin!~: Never start the engine or operate
the vehicle without the pulley guard
installed.
Drive Belt Removal
1. Tilt or remove cab. Remove pulley
guard. Open the driven , twist and
push the sliding and hold in place.
2. Puli
the bottom of belt in toward the
driven
pulley then slip slackened belt
over the top edge of driven pul
3. Slip the
belt from tile drive pu]
install, follow reverse procedure.
Warning: Never start or run the engine
without drive belt installed.

u,nRotary Valve System
298·345 Models
Check reservoir oil level Level
should be 1/2 inch
from top of plastic
reservoir located on upper
column.
Replenish, Ski-Doo chaincase oil.
Caution: Never operate engine without
adequate inlet/outlet oil circulation. If
circulation is poor or non-existent. fill
reservoir, remove plugs and crank
until oil circulates.
441 model
Remove white located on exhaust
side of and check if oil level
flush
with bottom lip of hole. ish
chaincase oil. To facilitate drainaqe.
a
drain pi is located on the lower
crankcase
iL21 Steering Mechanism
Oil spring coupler bolts. Lubricate ski legs
at grease
fittings until new grease appears
at
joints.
ILSI Chaincase Oil Level
Remove
filler cap and Llsing a wire,
check oil level, The oil level on the
"dipstick" should be 1/2" - 3/4" max.
When necessary, replenish using Ski-Doo"
chaincass oil. The oil capacity is approxi-
mately 6 OlS.
5

6
(l4) Driven Pulley
1. Remove or tilt cab, remove pulley
and drive belt. Open driven ley
clean shaft.
of belt grime. (The
bushing does
not require
(L5l Hydraulic Disc Brake (Oil leven
Brake hosesshould be checked for abrasion
and signs
of leakage. The fluid level in the
master inder should also be checked.
Caution: Use only hydraulic brake fluid
available from vour Ski-Doo" dealer.
Never
recuse brake fluid obtained by
bleeding.
To check
fluid level. tum handlebar- to
right and remove reservoir cover iocated
on handlebar. Fluid must reach top lip of
reservoir. The must contact
the brake fluid.
Warning: The entry of dirt or foreign par-
ticles into the brake fluid may constitute
system flushing.
Fiiiing and Bleeding
if the reservoir is low and/or air has en-
tered the system a soft, spongy
brakinq action, the
following should be
done.
1. Remove reservoir cover and dia-
,then
"top fl uid level, (Re-
tain this reservoir level
throughout the
fol }
2. Connect a bleeder
drain to the valve
and insert end of bleeder hose
into a
container of brake fl
uid.
3. Repeatedly depress the brake lever in
quick succession, (pumping), to obtain.
pressure. Once obtained, hold 'open
bleeder valve then
quickly depress
lever. Close bleeder valve and allow brake
to return
Continue and releasing brake
lever
until the fluid Injected into the con-
tainer is air free.
5. Disconnect bleeder hose, recheck brake
fluid level and install reservoir cover.
Note: Change brake fluid at least once
the season.
*Trr<dec"UK Bombardier Limited

Norma! (8rownish)
wires and re-
Code Weekly Page
W1 Spark Plugs 7-
W2 Suspension Springs 7
W3 Track
Condition 8
v\!4 Track Tension 8
W5 Track
Alignmant
8
W6 Chain Tension 8
W7
Carburetor Adjustment 9
W8 Drive Belt Condition 10
Cpde
Monthly Page
M1 Carbur etor Flange Nuts 10
iv12 Steering Adjustment
10
M3
Engine Head Nuts
10
M4 Engine
Mount Nuts
10
M5 Alignment
11
M6 SI Shoe Wear 11
M7 Vehicle General Inspection 11
(W1) Spark Plugs
1. spark
move spark plugs.
2. Check condition of plugs:
• A brownish tip reflects ideal conditions,
(correct carburetor adjustment, spark
piug heat range; etc.)
ill ,6.. black insulator tip indicates fOUling
caused by; carburetor idle speed mix-
ture and/or high speed mixture too rich
incorrect fuel
ratio, wrong type
of spark (heat range), or excessive
idling.
Ii> p., light insulator tip indicates a
lean caused
by: carburetor
high speed mixture too lean,
wrong spark plug heat range, incorrect
fuel
mixing ratio, or a leaking sea! or
Caution: It. when checking spark
color, you find that the engine is not run-
ning
under ideal conditions, contact your
authorized Ski-Doo dealer,
3. Reinstall plugs and connect wires.
(W2) Suspension Spring Adjustment
With engine off, visually inspect suspension
Replace any
broken The
suspension is adjustable, the
front adjust-
ment
for the sudace the rear
for driver's weight. in either case, both
sides of the adjustment should be equal.

Track Condition
Lift the rear of the vehiele and support it
off the ground so that the track is free to
turn. With off, rotate track by hand
and visually inspect track
condition. Pay
particular notice to cross Iinks and rivets.
(W4) Track Tension
rear of vehicle and support it off the
ground.
Allow pressure of slide to extend
track
norrnallv, The slider shoesshould be
touching the cross links or track
inserts,
if track tension is too 100s8
rthe track
wiil haveatendency to Iftootight,
nA"-f,.",rr\,,,r''''A wiil be affected. Adjust to
correct tension loosening or t'"'h+c'','''''
adjuster bolts.
Note: Track tension and are
inter-related, Do
not adjust one without
the other.
(W5) Track Alignment
After track tension has been corrected
start
the engine and accelerate slightlv so
that track turns slowly. Check that track
is wei! centered and turns evenly. To cor-
rect, loosen the lock nut and tighten the
adjuster bolt on side where track is closest
to the frame. Tighten lock nut and recheck
alignment.
(we) Chain Tension
The correct chain tension is 1/4" at driven
pulley level. To check, with engine
move driven ley
from side to side,
correct, unlock tsnsioner bolt then turn
clockwise to increase counter-
clockwise to decrease.

Idle Speed IS}
Turn the Idle Speed Adjusting Screws
clockwise to increase idl ing speed, counter-
clockwise to decrease.
High Speed Mixture Ie}
Warning: High speed mixture adjustment
must be carried out only by an authorized
Ski-Doo dealer.
For mary adjustment however, with
encine off, turn High Speed Mixture Ad-
o, Screws fully clockwise until dosed.
not close too as screws
SCr8VI/ seats can be darnaged). Back off
screws counter-clockwise as follows:
!W7) Carburetor Adjustment
There are four different adjustments for
the carburetor.
(1) Maximum Throttle Opening, (2) idle
Speed Mixture, idle Speed, and (4)
High Mixture.
Maximum Throttle Opening
With engine off, throttle cable and
rod so that the throttle butterflies are
horizontal when throttle lever
touches handlebar.
Warning: Before starting engine make sure
carburetor throttle levers return to idle
position when handlebar throttle is re-
leased.
Idle Mixture (AI
A prirnarv adjustment (with engine off)
shouk] be made by first turning !dle Mix-
ture Screws fully clockwise until closed.
Do
not close too tightly as needle and/or
needle seat can be damaged. Back off
screws counter-clockwise as follows:
298 1/8 turn
345 turn
441 1/2 turn
545 1/2 turn
797 1/2 turn
For final start engine and
allow it to warm up. Turn Idle Mixture
Screws until engine reaches maximum
R.PNI. and obtain asteady idle and a fast
response of engine to
the throttle.
Idle Mixture Screw clockwise
produces aleaner
mixture; (more em/less
fuel); a richer rruxtur e
air/more fuel).
298
345
441
645
797
1turn
turn
1/2 turn
1/2 turn
1/2 turn
9

mount
10
(wa) Drive Belt Condition
Remove cab and inspect drive belt for
wear. If belt is less than 1" wide, replace.
Check condition of belt. Inspect for
cracks. 01" abnormal wear (uneven
wear. vvear on one side, etc .. !f abnormal
wear is noted, probable cause is pul ley
misal ',."-,m,~,,f
1MIi Carburetor Flange Nuts
/\tter the first two (2) hours of nn<c>r",ti",n
check of carburetor
, if necessary.
1M2} Steering Adjustment
Skis should have a toe out of 1/8" to
1/4 ' 1 tT18X. To check, measure distance
between skis at front and rear of leaf
springs. If adjustment is
position handlebar so that it is horizontal
to vehicle. Release turnbuckle locknuts
and rotate one or both turnbuckles to
obtain correct toe out. Firmly retighten
locknuts.
1M3) Engine Head Nuts
Remove cab and check head nut torque.
(16 to 18 ft/lbs when cold).
torque in a cross
IM4) Engine Mount Nuts
With cab rernoveo check
nuts.
to 25-35 ft/Ibs,

it
Aligning shims -----,
(M5) Pulley Alignment
Due to the installation position and meth-
ad
of attachment, the distance between
the center of the drive and driven pulley
shafts is non Should this dis-
tance vary, mounts for
security, distortion, etc. Distance should
be: 103/3" to 10 1/2".
Pul offset is 1/2" ± 1/16". When qreat-
er, transfer al shims from cam side
to
fixed pulley side of the driven
ley. When less than
7/16", transfer shims
from fixed pulley haif to cam side of
driven ley.
Verify tens!on of driven pulley
should be asfollows;
298~345 9 Ibs
441
~645~797 13 lbs
(M61 Slider Shoe Wear
During norma! driving, snow will act asa
lubricant and coolantfm the slider shoes.
Extensive
riding on ice or sanded snow,
(not to mention dirt, asphalt, etc. never
recommended] may create excessive heat
build up and cause premature slider shoe
wear. Always inspect shoe condition and
replace as necessary prior to all races.
iM1i Vehicle General inspection
Check electrical wiring and components,
retighten loose connections. Check
for
stripped wires or damaged insulations.
Thoroughly inspect the vehicle and tiqht-
en loose bolts. nuts and linkage.
if correction is frelocate
end. 11

and 441 models
-197 models
'---------~-----I;S:> ------------'
2

_.~._--------- hydraulic oisc ------------ --------------------
30n
30;"1
30/1

Arts~raphiques
Bombardier Limited, Valcourt, Quebec, Canada,
t.rtho:c In Canada, 480-0052
BOMBARDIER LIMITED
All rights reserved ©Bombardier Limited 1972