Trail Boss 250 - Polaris Trail Blazer Service Manual

GENERAL INFORMATION
1999 Model Specifications
MODEL: . . . . . . . . . .
MODEL NUMBER: .
ENGINE MODEL: . .
CARBURETION
Type . . . . . . . . . . . . . . . .
Main Jet . . . . . . . . . . . .
Pilot Jet . . . . . . . . . . . . .
Jet Needle . . . . . . . . . . .
Needle Jet . . . . . . . . . . .
Cutaway . . . . . . . . . . . .
Air Screw . . . . . . . . . . .
Valve Seat . . . . . . . . . . .
Fuel Octane (R+M/2)
CLUTCH
Type . . . . . . . . . . . . . . . . . . . .
Belt . . . . . . . . . . . . . . . . . . . . .
Belt Width (Projected) . . . . .
Side Angle (Overall) . . . . . .
Outside Circumference . . . .
Center Distance . . . . . . . . . .
Clutch Offset . . . . . . . . . . . .
Shift Weights . . . . . . . . . . . .
Primary Spring . . . . . . . . . . .
Secondary Spring . . . . . . . .
Driven Helix . . . . . . . . . . . . .
Spring Position (Helix) . . . .
Spring Position (Sheave)
ENGINE
Type . . . . . . . . . . . . . . . . . . . . . . .
Displacement . . . . . . . . . . . . . . .
Bore . . . . . . . . . . . . . . . . . . . . . . .
Stroke . . . . . . . . . . . . . . . . . . . . .
Compression Ratio . . . . . . . . . .
Cooling . . . . . . . . . . . . . . . . . . . .
Lubrication Type . . . . . . . . . . . .
Piston / Cylinder Clearance
Service Limit . . . . . . . . . . . . . . . .
Piston Marking . . . . . . . . . . . . . .
Piston Ring End Gap
Operating RPM±200 . . . . . . . . .
Idle RPM±200 . . . . . . . . . . . . . .
Compression Pressure
4/99

TRAIL BOSS 250

A99AA25CA
EC25PFE10
VM30SS Mikuni
145
40
5DP7-3
0-4(169)
2.0
1.0 Turn
2.5
. 87 Non-Oxygenated or
89 Oxygenated
PVT
3211077
1.188" (30.18mm)
26°
40.86 ±.12"
10±.12" (254.5mm)
0.5" (12.7mm)
16
Blue/Green
Red
40°
2
. . 2
2 Cycle, Single Cyl.
244 cc
2.8346" (72mm)
2.3622" (60mm)
6.1/1 Effective
Air
Oil Injected
. . . 0.0011 - 0.0021" (0.03 - 0.05mm)
0.006" (0.15mm)
3W,4W
. . . . . . . . .009"-.018" (.23mm-.46mm)
6000 RPM
700 RPM
. . . . . . . (Std) ±15%
JETTING CHART
Altitude Altitude
Below 0°F Below 0 F
Below -18°C
Meters Meters 0-900 0-900
(0-3000)
(Feet) (Feet)
900-1800 900-1800
(3000-6000)
1800-2700 1800-2700
(6000-9000)
2700-3700 2700-3700
(9000-12000)
- Turn AS out 1/2 - - 3/4 turn CCW from seat
CLUTCH CHART
Altitude Altitude
Meters Meters
0-900 0-900
(Feet) (Feet) (0-3000)
900-1800 900-1800
(3000-6000)
1800-2700 1800-2700
(6000-9000)
2700-3700 2700-3700
(9000-12000)
1.16
AMBIENT TEMPERATURE
0_ to +40_F 0 to +40 F +40 to +80 F +40_to +80_F
-18_to +5_C +5_ to +26_C
170 170 155 155 145 145
155 155 145 145 135 135
140 140 130 130 120 120
130 130 120 120 110 110
Shift Shift Clutch Clutch Driven Driven
Weight Weight Spring Spring Helix Helix
16 16 Blue/Green Blue/Green 2- -2 2 2
16 16 Blue/Green Blue/Green 2- -1 2 1
16 Mod 16 Mod Blue/Green Blue/Green 2- -2 2 2
16 Mod 16 Mod Blue/Green Blue/Green 2- -2 2 2
Polaris Sales Inc.
Above +80 F Above +80_F
Above +26_C
135 135
125 125
115 115
100 100