I am also getting blow by n oil out the top of rocker boxes, cause n how to stop it!?

After I have it running for a lil while (1340cc Harley Davidson motor, custom softtail) I start to get oil n a lil blow by, what would be the cause of that n how to stop it!I am also getting blow by n oil out the top of rocker boxes, cause n how to stop it!?
Take it to a harley dealer and have the engine rebuilt, sounds like the rings are shot.I am also getting blow by n oil out the top of rocker boxes, cause n how to stop it!?
Sounds like your piston rings, or burned valve only cure is to have new rings/valves installed and all that goes with it.
Take you rocker boxes off and clean the oil returns.

eye make up