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Thread: 2012 RSV4 SCORED cam and u bolt

  1. #1
    apriliaforum newb MR2step's Avatar
    Join Date
    Jun 2017

    2012 RSV4 SCORED cam and u bolt

    Measured two exhaust valve clearances at 0.13mm and 0.18mm. Took rear bank exhaust cam out for shim swap to see this, and found a small shaving of aluminum thread.

    What are your thoughts?

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  2. #2
    apriliaforum expert Gabro's Avatar
    Join Date
    Sep 2006
    Roma, Caput Mundi
    Shave is probably coming from head build at factory... sompetimes assebly line is not tha clean as it would have ;/
    anyway that scoring on both cam and bearing is not that bad, it can be polished a bit using a 600/1000 paper (oiled) and still being serviciable.

    What "scares" me it the tight clearance, it could be a start of valve guide wear, let see if Amauri jump in the thread, he is much more expert than me at it.

    As it's the rear head, that is pretty simple to inspect, i suggest you to correct both clearance and scoring issue, and have a look back after some miles.
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