HI JUST TOOK ENGINE TO BITS AND THE NUMBER 1 PISTON IS ALMOST IN HALF BAR THE BOTTOM SKIRT AND HAS A 5MM HOLE IN IT ...ANY SUGGESTIONS OF WHERE TO SOURCE NEW PISTON ? ITS PISTON NUMBER ONE WHICH I BELIEVE IS SAME AS NO 2 BUT DIFFERENT TO 3 AND 4 ..SOMEONE ALSO SAID THERE ARE PIANT SPOTS ON THE BOTTOM TOO MINE HAS A SORT OF YELLOW BROWN SPOT WHAT DOES THIS MEAN? CHEERS PS THE BORE IS FINE LUCKILY