Quote:
Originally Posted by Easy Rider  OK and the problem that causes the backfire is that it is WAY lean. So if you must adjust it OFF the ideal idle mixture, you should adjust in the direction of RICH, not lean (which is back toward where you started).
I would certainly give that a try before taking the carb apart again.
Stock pipes and air-box ?? |
In my experience, backfiring is the result of the mixture being
too rich, not lean. When it is too rich, then unburnt and sometimes still burning gases pass through the exhaust valve port and ignite or finish burning when they hit the high temperature of the header pipe. Then the fuel igniting in the header pipe (backfiring) instead of in the cylinder, makes the header pipe a lot hotter causing the header pipe to start to turn blue.