Page 18 of 19
97-3
TECHNICAL DATA
TECHNICAL DATA
A dot (•) on right indicates changes from 1996 model.
NOTE:
See end of specifications for foot notes.
MODEL
SUMMIT 670
Engine Type
670
Maximum HP RPM
➀
±100 RPM
7700
•
Rotary Valve
P/N
Opening (BTDC)/
Closing (ATDC)
420 9245 00
145°/71°
•
Carburetor Type
PTO VM 40 - 90
MAG VM 40 - 91
•
Main Jet
PTO 380
MAG 370
Needle Jet
AA-2 (224)
•
Pilot Jet
75
Needle Identification– clip Position
7DPI1
•
Slide Cut-away
2.5
Float Adjustment
±1 mm (in)
18.1 (.71)
•
Air Screw Adjustment
± 1/16 turn
2-1/4
Idle Speed RPM
±200 RPM
1900
•
Gas Grade/Pump Octane Number
(R + M)/2
Regular Unleaded/87
Gas/Oil Ratio
Oil Injection
Ignition Timing BTDC
➁
mm (in)
1.93 (.076)
Trigger Coil Air-Gap
mm
(in)
0.55 - 1.45
.022 - .057)
Gear Ratio
teeth
23/44
Engagement Speed
±100 RPM
4100
•
Drive Pulley Calibration Screw Position
5
•
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
1 mm (1/32 in) to 2 mm (5/64 in)
Drive Belt Adjustment
Deflection
±.5 mm
(in)
32
(1-1/4)
Force
➂
kg (lbf)
11.34 (25)
•
Driven Pulley Preload
±0.7 kg (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)
45 to 50 (1-3/4 - 2)
with a 7.3 kg (16 lb) downward pull
