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GENERAL INFORMATION
SPECIAL TOOLS - PVT SYSTEM
TOOL
Drive Clutch Puller
Replacement Handle for
ALL Clutch Pullers
Drive Clutch Holding
Wrench
Drive Clutch Spider Nut
Socket
Drive Clutch Spider
Removal/Installation Tool
Clutch Pin Punch
Tapered Reamer - 33 mm
Clutch Alignment Tool
Roller Pin Installation
Roller/Bushing Alignment
Tool
Drive Clutch Button
Removal Tool
Clutch Bushing
Replacement Tool Kit
Clutch Holding Fixture
Universal Drive/Driven
Clutch Compressor
(Screw Down Type)
Spring-Loaded Roller Pin
Installation Roller/Bushing
Alignment Tool
Drive Clutch Compression
Tool (Compresses drive
clutch without removing
clutch from engine.)
Bosch Automotive Service Solutions 1-800-345-2233
or https://polaris.service-solutions.com
9850064 R03 - 2021 650 / 850 Matryx Trail Performance / Crossover Snowmobile Service Manual
© Copyright Polaris Inc.
DRIVE SPRING
The drive spring opposes the shift force generated by the
PART NUMBER
clutch weights, and determines the neutral RPM,
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engagement RPM, and whether the engine RPM
remains flat, rises, or falls during shift out. When
changing only the drive spring, installing a spring with a
5020326
lower pre-load rate will result in a lower engagement
RPM speed, while installing a spring with a higher pre-
9314177-A
load rate will result in a higher engagement RPM.
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CLUTCH WEIGHT
The clutch weights generate centrifugal force as the drive
2870341
clutch rotates. The force generated changes in relation to
the engine RPM and with the specified weight of each
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clutch weight. When changing only the clutch weights, a
lighter weight will result in a higher engagement RPM,
PU-52497
lower shifting force, and higher shift out RPM. Installing
PS-51607
heavier weights has the opposite effect
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NEUTRAL SPEED
A specific engine RPM speed when the force generated
by the clutch weights is less than the pre-load force
2870985
generated by the drive spring. In this mode, the drive
clutch is disengaged.
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ENGAGEMENT RPM
Engine engagement RPM occurs when the force
generated by the clutch weights overcomes the drive
PU-50518
spring pre-load force and the moveable sheave begins to
close or "pinch" the drive belt. The engagement mode
continues until no more belt slippage occurs in the drive
clutch. Once 100% belt engagement is achieved, the
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sled will accelerate along the low ratio line until the drive
clutch up shift force overcomes the opposing shift force
generated by the driven clutch.
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SHIFT OUT OVER-REV
An engine RPM that spikes above the desired operating
RPM speed. The shift out RPM should come down to the
desired operating RPM, but never below, after the driven
clutch begins to open.
PVT SYSTEM
7
7.3
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