Posted by Allan In NE on December 27, 2008 at 09:20:46 from (148.78.243.25):
In Reply to: 656 pops when idling posted by Scott in Illinois on December 27, 2008 at 08:14:48:
Hey Scott,
Backfiring is "almost always" caused by the primary ignition, which is allowing the spark to enter the exhaust system after the exhaust valve is starting to open.
I'd take a real close look at the points, their setting, any chaffed wires and also the distributor advance.
However, other things that could cause it include: ignition timing, ignition components, valve adjustment, sticking valves, broken valve springs, worn cam/gears or a burnt valve.
Just don't think your carb is causing that problem.
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