Piston / Ring Identification; Accessible Components; Engine Removal - Polaris PREDATOR 50 2009 Manual

Piston / Ring Identification

The letters "IN" or the larger of two valve pockets on the piston
face the intake side of the engine (UP). Other numbers may be
used for size identification. Generally, four stroke engine rings
have a rectangular profile. The numbers or letters on all rings
must be positioned upward. Un-marked rings (such as oil
control ring rails) are non directional. Always see ring
installation text for specific ring information.

Accessible Components

NOTE: The top-end of the engine can be serviced
without pulling the engine from the ATV. Loosen the
upper steering post mounting bolts to allow enough
clearance to remove cylinder head and cylinder.
However, it is recommended to pull the engine to
service top-end components.
The following components can be serviced or removed with the
engine installed in the frame:
• Flywheel
• Alternator/Stator
• Starter Motor/Starter Drive
• Oil pump
• Carburetor
• Transmission
The following components require engine removal for service:
• Cam Chain and Cam Chain Drive (Lower) Sprocket
• Cylinder Head
• Rocker Arms / Shafts
• Cylinder
• Piston / Rings
• Camshaft
• Crankshaft
• Crankshaft Main Bearings
• Crankcase
• Valves
NOTE: Crankshaft components are not serviceable.
Replace crankshaft as an assembly.
ENGINE / TRANSMISSION

Engine Removal

1. Clean the ATV and work area thoroughly.
2. Remove seat.
3. Remove front cab and foot rests.
4. Disconnect battery cables.
5. Drain engine oil and / or transmission oil as required for the
service to be performed. (Chapter 2)
6. Disconnect or remove from RIGHT Side:
• Exhaust Pipe
• Spark Plug Wire
• Drive Sprocket Cover / Sprocket / Chain
• Starter Motor
• Wire Connector - Stator and Neutral Switch
• Carburetor / Manifold
• Breather Hose
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