Cylinder Head Inspection - Polaris 850 MATRYX INDY XC 129 2021 Manual

ENGINE / COOLING / EXHAUST
4. Remove the cylinder head
5. Remove and discard the cylinder head o-rings.
Always use new o-rings during assembly.
6. Inspect the cylinder head / combustion domes for any
damage. Measure cylinder head flatness. Replace
cylinder head if required.
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9850064 R03 - 2021 650 / 850 Matryx Trail Performance / Crossover Snowmobile Service Manual

CYLINDER HEAD INSPECTION

The engine cylinder head must be flat to properly seal.
Use a precision straight edge and a feeler gauge to
inspect cylinder head for warping.
MEASUREMENT
Cylinder Head Warp Limit:
0.006 in (.015 mm)
Replace cylinder head if warping exceeds specification.
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