Ski-Doo Formula 500 1998, Shop Manual

Page: 344 / 398

Section 10 TECHNICAL DATA
Subsection 02 (ENGINES)
10-02-5
VEHICLE MODEL SKANDIC WT LC
ENGINE TYPE 494
Number of Cylinders 2
Bore mm (in) 69.5 (2.736)
Stroke mm (in) 65.8 (2.59)
Displacement
cm 3 (in 3 )
499.3 (30.47)
Compression Ratio (corrected) 6.8
Maximum Power Engine Speed
➀
± 100 RPM 7000
Piston Ring Type
1
st
/2
nd ST/R
Ring End Gap
New
Wear Limit mm (in)
mm (in) 0.25 (.010)
1.0 (.039)
Ring/Piston Groove Clearance
New
Wear Limit mm (in)
mm (in) 0.04 (.0016)
0.2 (.0079)
Piston/Cylinder Wall Clearance
New
Wear Limit mm (in)
mm (in) 0.11 (.0043)
0.15 (.0059)
Connecting Rod Big End Axial Play
New
Wear Limit mm (in)
mm (in) 0.39 (.0154)
1.2 (.0472)
Maximum Crankshaft End-play
➁
mm (in) 0.3 (.012)
Maximum Crankshaft Deflection mm (in) 0.08 (.0031)
Rotary Valve Timing
➂
and P/N 420 924 XXX
Opening
Closing
148° – 52°
509
Magneto Generator Output W 220
Ignition Type CDI
Spark Plug Make and Type NGK BR9ES
Spark Plug Gap mm (in) 0.45 (.018)
Ignition Timing BTDC
➃
mm (in) 1.81 (.071)
Trigger Coil
➄
Ω
190 – 300
Generating Coil
➄
Ω
10 – 17
Lighting Coil
➄
Ω
0.20 – 0.35
High Tension Coil
➄
Primary
Ω
0.3 – 0.7
Secondary k
Ω
8 – 16
Carburetor Type PTO/MAG VM 34
Main Jet PTO/MAG 250/220
Needle Jet 159-P2
Pilot Jet 30
Needle Identification
— clip position
6DH4-3
Slide Cut-away 2.5
Float Adjustment ± 1 mm (± .040 in) 36.5 (1.44)
Air Screw Adjustment ± 1/16 Turn 1.0
Idle Speed ± 200 RPM 1900
Gas Type/Pump Octane Number Unleaded/87
Gas/Oil Ratio Injection
Type Liquid
Axial Fan Belt Adjustment
Deflection
➅
mm (in) N.A.
Force kg (lbf) N.A.
Thermostat Opening Temperature °C (°F) 42 (108)
Radiator Cap Opening Pressure kPa (PSI) 90 (13)
ENG
INE
C
O
LD
N•
m
(
lb
•ft
)
Drive Pulley Retaining Screw
➆
Exhaust Manifold Nuts or Bolts 22 (16)
Magneto Ring Nut 125 (92)
Crankcase Nuts or Screws
M6
M8 9 (6.5)
21 (16)
Crankcase/Engine Support Nuts or Screws 39 (29)
Cylinder Head Nuts 29 (21)
Crankcase/Cylinder Nuts or Screws 29 (21)
Axial Fan Shaft Nut N.A.