General Information; Service Specifications; Important Engine Service Notes - Polaris 850 MATRYX INDY XC 129 2021 Manual

GENERAL INFORMATION

SERVICE SPECIFICATIONS

ENGINE
DESCRIPTION
Cylinder Head Warp Limit
Cylinder Taper Limit
Cylinder Out-of-Round
Limit
Piston Measuring Point
Piston to Cylinder Service
Limit
Reed Valve Air Gap
Connecting Rod Side
Clearance
Crankshaft Runout Limit
9850064 R03 - 2021 650 / 850 Matryx Trail Performance / Crossover Snowmobile Service Manual
© Copyright Polaris Inc.

IMPORTANT ENGINE SERVICE NOTES

The Oil Pump Enrichment Mode Timer MUST be reset
using Digital Wrench whenever the following engine
service actions are completed:
SPECIFICATION
• Engine rebuild
0.006 in (.015 mm) • New cylinder installed
• New pistons / rings installed
0.002 in (0.051 mm)
• New crankcase installed
0.002 in (0.051 mm)
• New crankshaft / crank bearings installed
• New water pump cross shaft installed
0.98 in (25 mm)
To reset the Oil Pump Enrichment Mode Timer, see Oil
0.0079 in (.200 mm)
Pump Enrichment Mode Timer Reset page 1.57.
0.015 in (.381 mm)
0.030 in (0.762 mm)
0.0025 in (0.030 mm)
The Electronic Oil Pump Prime procedure MUST be
performed using Digital Wrench whenever the following
engine service actions are completed and the engine has
been reinstalled back into the chassis:
• Engine rebuild
• New cylinder installed
• New pistons / rings installed
• New crankcase installed
• New crankshaft / crank bearings installed
• New water pump cross shaft installed
• Oil supply hoses to engine have 1 inch (2.54 cm) or
• Oil pump is replaced
To perform the Electronic Oil Pump Prime procedure, see
Electronic Oil Pump Prime Procedure page 1.64.
ENGINE / COOLING / EXHAUST
ENGINE RUN
BREAK-IN
TIME
FUNCTION
DURATION
Fuel Injectors
2 hours *
Oil Pump
Enrichment 10 Hours *
Period
* = Total engine run time above 3,500 RPM
larger air bubbles
NOTICE
Perform the Electronic Oil Pump Prime procedure until
ALL of the air is purged from the lines and then prime at
least two additional times to push oil into bearings.
3
DESCRIPTION
2% additional
fuel
15% additional
enriched oil
supply to engine
3.5