my crusier has 40k on it,recently over serviced oil 8-16oz after oil & filter change.after a short warmup took for a spin and oil started coming out of CC vent in airfilter assy.drained some oil out to safe level, bike still pumping oil out CC vent and only when in 4th or 5th.is there a seal or check valve that´s damaged or stuck local mechs no clue and not willing yet to pay $100/hr to find out.this bike has been problem free until now can anyone steer me in the right direction.