2004 650 Twin Arctic Cat ATV Service Manual, Page 197Get this manual

2004 650 Twin Arctic Cat ATV Service Manual, Page 197

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Problem: Engine lacks power Condition 1 Valve clearance incorrect 2 Valve springs weak 3 Valve timing out of adjustment 4 Piston ring(s)cylinder worn 5 Valve seating poor 6 Spark plug fouled 7 Rocker