2011 Arctic Cat 400 TRV ATV Service Manual, Page 24Get this manual
Problem: Engine lacks power Condition 1234567891011121314Valve clearance incorrect Valve springs weak Valve timing incorrect Piston ring(s)cylinder worn Valve seating poor Spark plug fouled Rocker armsshafts worn Spark plug gap incorrect Carburetor jets obstructed Float level out of adjustment Air cleaner element obstructed Engine oil overfilledcontaminated Intake manifold leaking air Cam chain worn
1234567891011121314Adjust clearance Replace springs Re-time valve gear Replaceservice ringscylinder Repair seats Cleanreplace plug Replace armsshafts Adjust gapreplace plug Clean jets Adjust float height Clean element Drain excess oilchange oil Tightenreplace manifold Replace cam chain