2007 Arctic Cat DVX/Utility 250 ATV Service Manual, Page 140Get this manual
Problem: Engine runs poorly at high speed Condition
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High RPM "cut out" against RPM limiter Valve springs weak Valve timing out of adjustment Camsrocker arms worn Spark plug gap too narrow Ignition coil defective Float level too low Air cleaner element obstructed Fuel hose obstructed
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Shift into higher geardecrease speed Replace springs Adjust timing Replace camsarms Adjust gap Replace ignition oil Adjust float height Clean element Cleanprime hose
Problem: Exhaust smoke dirty or heavy Condition
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Oil (in the engine) overfilledcontaminated Piston ringscylinder worn Valve guides worn Cylinder wall scoredscuffed Valve stems worn Stem seals defective Air cleaner element obstructed Float level too high
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Drain excess oilreplace oil Replaceservice ringscylinder Replace guides Replaceservice cylinder Replace valves Replace seals Clean element Adjust float level