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My son's z50 ran with low oil at glamis and something let go. The bike will idle, lots of burnt oil coming out the exhaust (white smoke). The plug is wet with oil. Not a mechanic any idea on what needs to be replaced? Was thinking the of replacing the cylinder head but wasn't sure that was the answer or not. Thanks in advance
 

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If you are lucky, just piston and rings. Varying degrees of luck come into play though.

Piston and Rings
Cylinder (bore or replace) along with pistons and rings

Then it just gets much worse from there. crank bearings, rocker cam, etc. Pull the head off and look down inside. Any gouges and the cylinder will most likely need to be bored.
 
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