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Valve stem seals are installed to prevent oil from the cylinder head from entering the combustion chamber via the valve guides. A blue smoking exhaust can be an indication for defective valve stem seals.
KTM: | Duke 125, Bj. 2011-2016, Duke 125, Bj. 2017-, RC 125, Bj. 2014 - 2016, RC 125, Bj. 2017- |
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