97-3
Page 15 of 19
TECHNICAL DATA
TECHNICAL DATA
A dot (•) on right indicates changes from 1996 model.
NOTE:
See end of specifications for foot notes.
MODELS
FORMULA 500/500
DE LUXE
FORMULA 583
Engine Type
494
583
Maximum HP RPM
➀
±100 RPM
7750
•
7900
•
Rotary Valve
P/N
Opening (BTDC)/
Closing (ATDC)
420 9245 09
135°/64°
420 9245 02
140/71
Carburetor Type
PTO VM 38 - 345
MAG VM 38 - 346
•
•
PTO VM 38 - 349
MAG VM 38 - 350
•
•
Main Jet
PTO 310/MAG 290
•
PTO 280/MAG 270
•
Needle Jet
P-3 (480)
•
Q-6 (480)
•
Pilot Jet
50
•
50
•
Needle Identification – clip Position
6FEY1
•
6BGY15
•
Slide Cut-away
2.5
2.5
Float Adjustment
±1 mm (in)
18.1 (.71)
18.1 (.71)
Air Screw Adjustment
± 1/16 turn
1-1/2
•
2-1/4
•
Idle Speed RPM
±200 RPM
1800
•
1800
•
Gas Grade/Octane Number
(R + M)/2
Regular Unleaded/87
Regular Unleaded/87
Gas/Oil Ratio
Oil Injection
Oil Injection
Ignition Timing BTDC
➁
mm
(in)
1.81 (.071)
1.75 (.069)
Trigger Coil Air-Gap
mm
(in)
0.55 - 1.45(.022 - .057)
0.55 - 1.45(.022 - .057)
Gear Ratio
teeth
23/44
•
25/44
•
Engagement Speed
± 100 RPM
4200
•
4100
•
Drive Pulley Calibration Screw Position
3
3
Pulley Distance
Z
(+ 0, – 1) mm
(+ 0, – 1/32) in
16.5
(21/32)
Offset
X
± 0.4 mm
(± 1/64 in)
35.0
(1-3/8)
Y
Dimension Y must exceed X
from 1mm (1/32in)
to 2 mm (5/64 in)
Drive Belt Adjustment
Deflection
mm
(in)
32
(1-1/4)
Force
➂
kg (lbf)
11.34 (25)
•
Driven Pulley Preload
±0.7 kg
(±1.5 lbf)
7.0 (15.43)
•
Drive Chain Tension
Fully tighten adjusting screw by hand then back OFF only
far enough for hair pin installation
Track Adjustment
Deflection
mm
(in)
40 to 55 (1-9/16 to 2-5/32)
with a 7.3 kg (16 lb) downward
pull
30 to 40 (1-3/16 to 1-9/16)
with a 7.3 kg (16 lb) down-
ward pull
•
