| If the bike is only 6 months old surely the piston and barrel should be replaced under warranty? Sounds like it has nipped up, possibly due to overtight manufacturing clearances or over exuberant riding during the running in period.
Inspecting the bearing shells and oil pump requires total dismantling of the engine. Are you capable of doing this? If the work is done by anybody other than an authorised dealer the warranty will probably be void.
In my own experience, as long as the piston and cylinder are replaced the engine will probably be OK. | 
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