TOMT 0 Posted February 17, 2001 IS IT POSSIBLE FOR A DEFECTIVE BREATHER TO CAUSE OIL DEPOSITS IN THE COMBUSTION CHAMBER &/OR OIL BEING PRESENT IN THE CARBURETOR i.e. PRESSURE BUILDUP. THE INFO I HAVE INDICATES THAT IT'S DEFECTIVE IF A .045" WIRE CAN BE INSERTED BETWEEN THE DIAPHRAGM & THE CASE. SECOND QUESTION THIS IS AB&S 243431 TYPE ENGINE(1970 VINTAGE).DO I NEED TO HAVE THE FLYWHEEL REPOLARIZED TO CHANGE TO THE ELECTRONIC IGNITION? THERE SEEMS TO BE VARYING OPINIONS ON THIS ISSUE(EVEN WITH THE LOCAL DEALERS). ANY HELP WOULD BE APPRECIATED. TOMT Share this post Link to post Share on other sites
Sandy_Lake_Imp 2 Posted February 17, 2001 A faulty breather will let air draw in to the crankcase when the piston travels up, then when the piston comes back down all that air will be pushed out the breather & will have sufficient force to carry oil with it into the carb & intake. A bad crankshaft seal can also allow this to happen. As for the polarizing the consensus seems to be that your vintage engine would need redone but I have not made this conversion to know firsthand. Bill Share this post Link to post Share on other sites