1998 Trail Blazer W98Aa25C (Engine -Ec-25Pfe-11) - Specifications And Clutching And Jetting Guidelines For Altitude And Temperature - Polaris Magnum 2x4 Service Manual

FUEL SYSTEM/CARBURETION
1998 Specifications
1998 TRAIL BLAZER
W98BA25C
(Engine - EC-25PFE-11)
SPECIFICATIONS AND CLUTCHING AND JETTING GUIDELINES
FOR ALTITUDE AND TEMPERATURE
Carburetor VM30SS
Main Jet - 130 Pilot Jet - 40
Float Level - Float arm parallel with bowl gasket surface (Page 4.22)
Cut Away - 2.0 Air Screw - 1 Turn CCW from Seat*
Jet Needle - 5DP7-3 Needle Jet - 0-4 (169)
Needle Seat - 2.5
Flywheel Marking: FF45 COl Marking: CU2167 Alternator Output: 150 Watts
Ignition Timing: 25° BTDC
@
3000 RPM (± 3°) Spark Plug: BR8ES Gap: .028 (.7mm)
Operating RPM: 5800 (± 200)
Idle RPM: 700 (± 100)
*Turn in (clockwise) one quarter turn for each 30 degrees below 60 degrees F.
Turn out (counterclockwise) one quarter turn for each 30 degrees above 60 degrees F.
Observe the following altitude recommendations and set up the vehicle accordingly.
Altitude Below O°F 0° to 40°F +40° to +80°F +80°F
&
Above
(Below -18°C)
(-18°C to +5°C) (+5°C to +26°C)
(+26°C
&
Above)
Meters 0-900
150 140 130 120
(Feet) (0-3000)
900-1800
140
130
120 1tO
(3000-6000)
."
.
.
1800-2700
125 120
I
.
110 .•.•..
100
.
...
(6000-9000)
.'
.
,
.........
...
2700-3700
115
••
110 .::.
. ' ...• 100·.·.· . . · · ·
95
..
.
(9000-12000)
··1
.' .
.......
, . . . . . I -
Turn air screw out 1/2 turn (counterciockwise)Shaded Zone should
drop Jet Needle one position to lower jet needle
Clutching
Altitude Shift Clutch Driven
Weight Spring
Helix
Meters 0-900 G Blue/Green
2-2
(Feet)
(0-3000)
900-1800 G Blue/Green
2-1
(3000-6000)
1800-2700 16 Blue/Green 2-2
(6000-9000)
2700-3700 16 Blue/Green 2-1
(9000-12000)
Polaris Industries Inc.
4.4e
5/98