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Old 10-13-2018, 07:59 PM   #22
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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.

It'll feel better when it quits hurting.
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