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Blown engine!

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Have you got some pics of the side of the pistons as well? It doesnt look like the sides are scratched up which is where you'd normally expect to see damage, just the front/back which is weird. Is the damage to them all on the fronts, or is it equal front and back.

Is it all the pistons or just one? 

Have you got the crank out too? How do the thrust bearings look - aka does it look like the whole crank has walked forward/back?

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I had a look through the tune and it isn't the best, your part throttle fueling is all over the place and acceleration enrichment is off as evident by large lean spots after throttle changes in the log, could have been transient knock hammering the pistons, are there scuffs in the bore at tdc?

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