Combustion Chamber Cleaning; Valve Seat Reconditioning - Polaris ACE 900 2017 Service Manual

COMBUSTION CHAMBER CLEANING

WARNING
Wear eye protection during combustion chamber
cleaning.
1. Clean all accumulated
combustion chambers and valve seat area
NOTICE
Carbon Clean Fuel Treatment (2871326) can be used
to help remove carbon deposits.
Do not use a metal scraper, a coarse wire brush or
abrasive cleaners to clean the cylinder head. Damage
may result.
2. Visually inspect cylinder head gasket surface and
combustion chamber for cracks or damage. Pay
close attention to areas around spark plug and valve
seats.
9929422 R02 - 2017-2019 ACE 900 Service Manual
© Copyright Polaris Industries Inc.

VALVE SEAT RECONDITIONING

Valve seat reconditioning should be performed by a
technician proficient in cylinder head reconditioning
techniques. Reconditioning techniques vary, so follow
the instructions provided by the valve reconditioning
equipment manufacturer. Do not grind seats more than
necessary to provide proper seat surface, width, and
carbon deposits from
contact point on valve face.
q
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ENGINE / COOLING SYSTEM
WARNING
Wear eye protection or a face shield during cylinder
head disassembly and reassembly.
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