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I have a 2017 450HO with ESP. The valves seem louder then normal. Is a valve adjustment covered under the Polaris extended warranty
 

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Wouldn't think so, that's a maintenance thing. Never hurts to talk to your dealer & see what they say.
 

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Valves don't get noisy in OHC engines unless there is a another problem (broken spring, bad cam) - valves in OHC engines tend to get tight and need to be adjusted periodically to prevent loss of compression. If it is a bad cam or broken spring, it probably would be under warranty unless it has been over heated or run low on oil - evidence can be seen when it is worked on.
 
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