2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 67Get this manual

2008 Polaris ATV Sportsman 300 400 H.O. Service Manual, Page 67

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ENGINE (300) If the contact area of the cutter is in the same place, the valve guide is distorted from improper installation and must be replacedBe sure the cylinder head is at the proper temperature