That photo looks vaguely familiar...
If indeed the Bike mentioned is mine, then I would like to clarify the post by 'Yodagoat'
My Motor has indeed been extensively rebuilt, well in excess of £3000.00 worth...
It has a new Short Motor plus a load of other bits.....BUT, It has not had new Pistons!!
In fact, when the motor was taken down, the Pistons and Valves looked spot on, no pitting, everything was as sweet as you could wish for with 24000 miles on...!
The problem was a Mechanical Failure, apparently a woodruff key failed resulting in the valve gear letting go which then kissed the piston crowns and bent the valve stems.
When it was finally stripped down it transpired that there had been an issue with Oil supply resulting in All the valve gear having to replaced too...
Luckily it threw a six at tick-over so no major damage to the pistons...hence their reinstatement within the new motor, there was nowt wrong with them.
The only bits left over from the original motor were the Pistons, Barrels and Empty Heads
So to the original point here.........the damage to my engine had Fek-all to do with the fact that I had used it from new, initially with a 'Y' piece and Carbon Can, then for the last 9000 miles with the Cat and 'U' Bend.....
I'm just glad that when I had been giving it some 'Berries' a month earlier on the Nurburgring, it didn't let go then, could have been an exciting moment or two...
I suppose there could have been another 1150 with a totally goose'd motor and the Techi had been referring to that....
Needless to say, the 'U' Bend lives on...