ENGINE BREATHERS ARE EXACTLY THAT ,THEY VENT EXECES FUMES INTO AIR INTAKE OR ATMOSPHERE USUALLY FROM WORN RINGS/BORE,THAT SAID THE FIRST THING ID DO IS GIVE IT A FULL TAPPET CLEARANCE CHECK.WOULDENT BE THE FIRST ONE I FOUND TO HAVE A VALVE CLEARANCE TIGHT ENOUGH TO LET INLET/EXHAUST FUMES/PRESSURE INTO THE BREATHER.CHECK MANUAL FOR PROCEDURE ,AND CHECK COLD MEANS NOT RUN SINCE YESTERDAY.
CAINE
June 2008