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Old 10-13-2018, 07:59 PM   #22
1crosscut
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Join Date: Feb 2011
Location: Lincoln, Nebraska
Posts: 1,229
Default Re: Terriable backfiring

Check to make sure the spring on the moveable arm of the points is strong enough. It was mentioned in an earlier post. Hook a fingernail on it and pull it apart. It should give you a bit of a tussle.

A bad flexible wire under the upper plate can cause the backfire at high rpms too.

Did you recently have your carburetor apart? Leaving out the venturi will cause similar troubles.
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