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Discussion Starter #1 (Edited)
My nephew has an 09 Raider that is now blowing smoke out the rear cylinder. Could be rings or valve seals. Anybody have any insight or what to check before this engine gets torn down?
 

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Discussion Starter #3
I will definitely check compression. Was really asking if there are any known problems with rings, seals or even crankcase breather systems?
 

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found the problem
what causes a crack like this?
Overheating. Starting a cold engine and running it like a raped ape cold. Lack of lubrication. Defect. A very misfortunate detonation. Cooking oil. Etcetera. Several things can cause it. Other damage should be evident if it's something like an extremely lean condition. That piston looks like it got pretty hot in that picture.
 
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