really bad leak from bottom end!

[craigz9876]

just finished building my topend up and i did a leak down test and i got a really bad leak! as fast as i pressure it up it blows out of the engine breather.
i stripped the clutch off and i think it is coming from behind the balancer shaft bearing! can it come from there? i was thinking the centre case gasket could be leaking or is there another seal that can couse this? its not the crank seals

 

[cole454]

Yeah, its leaking from between the cases. Gonna have to split and reseal.

 

[craigz9876]

just as i thought, gonna take it out and drop it off at local shop. said he will do it for £40 and build it all back up for me luckily not run it yet since i built it, but i didnt have and irratic idling etc before i stripped it down