Garf,
FYI I bought a used B25 from a friend who had crashed it and damaged the case. I took the innerds apart and put them in a new case. The rod is bushed for the crankshaft pin, and the bushing, though it still fit tightly inside the rod and around the pin, had rotated about 30 degrees inside the rod so that the bushing/rod oil holes did not line up. I drilled a new oil hole and tried to move the bushing around inside. It was still smug so I gave it a try and have had no trouble for 15-20 flights.
The friend had been using the motor for SL combat with 8" props, but I have read that Aussies use it for speed and they haven't reported any probs, so not sure if higher rpms harmed it.
It's a great little motor with lotsa power, and a blast to fly on an F2D.