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IMPORTANT

The Owner's Manual for this vehicle contains warnings, instructions and other information you must read and fully understand before safely riding or performing maintenance on this vehicle. Always follow the warnings and instructions in Owner's Manual.

Click the link above for the Table Of Contents, or download a full PDF of the Owner Manual in the Owner Support area of Polaris.com.

BOOST Trail 129 / 137 / 146

Capacities and Dimensions

Body Style

Matryx

Rider Capacity

1

Coolant Capacity

(129 in) 6.3 qt (5.92 l)


(137 in) 6.5 qt (6.13 l)


(146 in) 6.67 qt (6.31 l)

Chaincase Oil Capacity

10 oz (296 ml)

Fuel Tank Capacity

11.5 gal (43.5 l)

Gearcase Oil Capacity

N/A

Oil Capacity (qts./l)

3.9 qt (3.7 l)

Drive Clutch Center Distance

10.625 in (26.99 cm)

Drive Belt P/N

3212325

Drive Clutch

P-22

Driven Clutch

Lightweight Team Roller Reverse

Reverse Transmission

Electronic Reverse

Engine and Cooling

Engine

ASM-ENG S8861–8444–LA8M

Displacement

840 cc

Cylinders

2-monoblock

Bore x Stroke (mm)

85 x 74

Alternator Output

500 w @ 5000 RPM

Throttle Body

1208880

Recommended Engine Oil

VES Extreme

Throttle Body Bore Size

48mm

Idle RPM

1800 +/- 200

Rated Operating RPM

8250 +/- 150

Cooling

Liquid

Ignition Type

CDI

Ignition Timing °BTDC

18° @ idle, 1700 RPM w/120°F (49°C) water temp

Spark Plug / Gap

NGK® BPR9ES / 0.027 in (0.7 mm)

Recommended Fuel Octane

91 octane recommended

Clutch Settings – BOOST Trail

Clutch Settings – BOOST Trail

ALTITUDE
meters (feet)

DRIVE CLUTCH

DRIVEN CLUTCH

GEARING

Shift Weight

Clutch Spring

Clutch Spring

Driven Helix

129/137 Track

146 Track

*Shaded cells indicate factory settings.

Use 2 gram lighter shift weights when operating in temperatures above 40 f (5 c).

Drive Clutch Bolt Torque: 110 ft-lbs (149 N·m). Re-torque after running engine.

0-600 (0-2000)

14–84

(1327230)

165/310

(7045965)

155/222

(7043063)

58/44/.36

(5143872)

23:37–68

1.0 Ripsaw II R

23:40–70

1.352 Cobra R


19:40–68

2.0 Crossover

600-1200 (2000-4000)

1200-1800 (4000-6000)

1800-2400 (6000-8000)

2400-3000 (8000-10,000)

3000-3600 (10,000-12,000)