Oil leak on GSXR engine?

[Edmundo2]

I own a Jedi hillclimber with an oil cooled big bore 1370cc GSXR engine in it. Problem is it leaks oil and I cannot find the source? I've tried new seals on starter/alternator/sprocket + have had engine out and sent away to Powertech to have cover faces machined + new gaskets. I did this because a recent rolling road session showed no leaks even when under load, however a smoke test showed a leak from hole where starter wires come up through ignition/rotor pick up cover.
The leak only appears after a twisty run which suggests to me that surge around corners plays a part + results in oil collecting on top of crank case between starter/alternator + on chassis tubes near sprocket side of engine. There's no sign of leaks from barrel gaskets or aeroquip etc?

Anyone experienced similar? The car goes fantastically and I've yet to try a run since getting engine back from builder but just thought I'd ask in case leak is still there and it's back to the drawing board?
Thanks, Ed.

[FM]

What is the score with crankcase ventilation?
Seen lot`s of variations on what people run using modified oil cooled engines, from a stock hose running back into the cam cover to chrome collection bottles to nothing at all. Perhaps it`s just oil surging under load finding little nooks..

[Edmundo2]

Hi. Hose back to head + breather from head to alloy catch tank. All checked and clear?

Ed.