timnsr250se wrote:hey guys,
its been a long time coming but ive finally got hold of a digicam and snapped some pics of my piston and cylinder. The bike had new pistons put in it approx 100kms before this happened... the previous pistons were missing about 1 cm of ring, so im thinking there still some metal bouncing around in thereAny remarks/comments/advice on fixing properly are welcome
http://www.bikepics.com/members/tvjoyce2002/91nsr250/
Cheers,
Tim
Looks like it`s just detonation to me.
Running a bit too lean/ too much compression for the fuel grade/ ignition timing advanced too far, etc.
Can`t see but I`d have thought the barrel would be okay & you `d be able to clean up the head I`d have thought. Meaning just a new piston really.