Let me see the routing of any with checkvalves making noise. Triple check that you have not mistakenly left the drain valve open.
If the drain is left open my mistake, the valve will hammer loudly.
If need be and all is routed correctly and drain is sealing, then email us and request a "Plain fitting" to replace the valve (like all other cans come with). Then there is nothing to make noise.
As for the breather leaking oil, something has to be wrong in routing if the fixed orfice barb has been drilled to 5/64" both top and the bottom 2 holes:
Before top:
and after:
Make sure to drill the bottom to holes as well.
(see how small they are? the entire crankcase must breath through these, and if they become obstructed at all it backs up through the breather.)
Just let us know directly if you need service or support and we can help the quickest.
