Ski-Doo Formula 500 1998, Shop Manual

Page: 340 / 398

10-02-1
Section 10 TECHNICAL DATA
Subsection 02 (ENGINES)
VEHICLE MODEL MX Z 440 MX Z 500 MX Z 583 MX Z 670
ENGINE TYPE 443 494 583 670
Number of Cylinders 2 2 2 2
Bore mm (in) 67.5 (2.6575) 69.5 (2.736) 76.0 (2.992) 78.0 (3.071)
Stroke mm (in) 61.0 (2.402) 65.8 (2.59) 64.0 (2.520) 70.0 (2.760)
Displacement cm 3 (in 3 ) 436.6 (26.64) 499.3 (30.47) 580.7 (35.44) 668.97 (40.82)
Compression Ratio (corrected) 6.4 6.8 6.7 6.2
Maximum Power Engine Speed
➀
± 100 RPM 7000 7800 7900 7700
Piston Ring Type 1 st /2 nd ST/R ST/R ST/N.A. ST/R
Ring End Gap
New
Wear Limit mm (in)
mm (in) 0.2 (.008)
1.0 (.039) 0.25 (.010)
1.0 (.039)
0.25 (.010)
1.0 (.039)
0.25 (.010)
1.0 (.039)
Ring/Piston Groove Clearance
New
Wear Limit mm (in)
mm (in) 0.04 (.0016)
0.2 (.0079)
0.04 (.0016)
0.2 (.0079)
0.04 (.0016)
0.2 (.0079)
0.04 (.0016)
0.2 (.0079)
Piston/Cylinder Wall Clearance
New
Wear Limit mm (in)
mm (in) 0.06 (.0024)
0.2 (.008)
0.11 (.0043)
0.15 (.0059) 0.11 (.0043)
0.15 (.0059) 0.10 (.0039)
0.15 (.0059)
Connecting Rod Big End Axial Play
New
Wear Limit mm (in)
mm (in) 0.2 (.0079)
1.0 (.0394) 0.39 (.0156)
1.2 (.0472)
0.39 (.0156)
1.2 (.0472)
0.39 (.0156)
1.2 (.0472)
Maximum Crankshaft End-play
➁
mm (in) 0.3 (.012) 0.3 (.012) 0.3 (.012) 0.3 (.012)
Maximum Crankshaft Deflection mm (in) 0.08 (.0031) 0.08 (.0031) 0.08 (.0031) 0.08 (.0031)
Rotary Valve Timing
➂
and P/N 420 924 XXX
Opening
Closing
N.A.
140° – 71°
502
140° – 71°
502
144° – 72°
500
Magneto Generator Output W 240 220 220 220
Ignition Type CDI CDI CDI CDI
Spark Plug Make and Type NGK BR9ES NGK BR9ES NGK BR9ES NGK BR9ES
Spark Plug Gap mm (in) 0.45 (.018) 0.45 (.018) 0.45 (.018) 0.45 (.018)
Ignition Timing BTDC
➃
mm (in) 1.38 (.054) 1.81 (.071) 1.75 (.069) 1.93 (.076)
Trigger Coil
➄
Ω
140 – 180 190 – 300 190 – 300 190 – 300
Generating Coil
➄
Ω
230 – 330 10 – 17 10 – 17 10 – 17
Lighting Coil
➄
Ω
0.23 – 0.28 0.20 – 0.35 0.20 – 0.35 0.20 – 0.35
High Tension Coil
➄
Primary
Ω
N.A. 0.3 – 0.7 0.3 – 0.7 0.3 – 0.7
Secondary k
Ω
5.1 – 6.3 8 – 16 8 – 16 8 – 16
Carburetor Type PTO/MAG VM 34 509/510 VM 38 380/381 VM 40 99/100 2 x VM 40 101
Main Jet PTO/MAG 205/195 330/300 280/260 310
Needle Jet 159 P-0 480-Q4 224-AA2 224 AA-3
Pilot Jet 35 50 60 60
Needle Identification
— clip position
6DH2-3 6DHY48-3 7ECY1-3 7EDY1-3
Slide Cut-away 2.5 2.5 2.5 2.5
Float Adjustment ± 1 mm (± .040 in) 23.9 (.94) 18.1 (.71) 18.1 (.71) 18.1 (.71)
Air Screw Adjustment ± 1/16 Turn 1-1/2 1.5 2 2.25
Idle Speed ± 200 RPM 1650 1800 1800 1700
Gas Type/Pump Octane Number Unleaded/87 Unleaded/87 Unleaded/87 Unleaded/87
Gas/Oil Ratio Injection Injection Injection Injection
Type Axial Fan Liquid Liquid Liquid
Axial Fan Belt Adjustment
Deflection
➅
mm (in) 8 – 9 (.31 – .35) N.A. N.A. N.A.
Force kg (lbf) 5 (11) N.A. N.A. N.A.
Thermostat Opening Temperature °C (°F) N.A. 42 (108) 42 (108) 42 (108)
Radiator Cap Opening Pressure kPa (PSI) N.A. 90 (13) 90 (13) 90 (13)
ENG
INE
C
O
LD
N•
m
(
lb
•ft
)
Drive Pulley Retaining Screw
➆ ➆ ➆ ➆
Exhaust Manifold Nuts or Bolts 22 (16) 23 (17) 23 (17) 23 (17)
Magneto Ring Nut 105 (77) 125 (92) 125 (92) 125 (92)
Crankcase Nuts or Screws
M6
M8 10 (7)
22 (16)
9 (6.5)
29 (21)
9 (6.5)
29 (21)
9 (6.5)
29 (21)
Crankcase/Engine Support Nuts or Screws 38 (28) 39 (29) 39 (29) 39 (29)
Cylinder Head Nuts 22 (16) 29 (21) 29 (21) 29 (21)
Crankcase/Cylinder Nuts or Screws N.A. 29 (21) 29 (21) 29 (21)
Axial Fan Shaft Nut 50 (37) N.A. N.A. N.A.