Re: Re: hard starting Super A

Posted by Bob M on January 22, 2004 at 07:29:55 from (165.170.128.66):

In Reply to: Re: hard starting Super A posted by john koritansky on January 22, 2004 at 06:02:24:

Your description leads me to believe you've got a weak spark problem - probably caused by a weak or mismatched (12 volt) coil. Suspect what's happening is the coil is providing an adequate spark on full 6 volts, but fails to provide a sufficient spark on the 4 volts or so it gets while cranking. This is why the engine sometimes fires the instant you release the starter switch, and why it fires up easily when hand cranked.

It's unlikely the starter is drawing excessive current. If it was the engine would crank very slowly or not at all. Also the starter would overheat (and probably begin smoke) after only a few seconds of cranking.

A couple quick tests:

1 - If you have a DC voltmeter place it across the battery terminals and observe it while cranking. If it reads no less than about 4 volts while cranking the starter is not drawing excessive current.

2 - Pull the center cable from the distributor cap and attach it to a good spark plug. Lay the plug on grounded metal. Now turn on the ignition and crank the engine with the starter while observing the spark at the plug. If you see a lazy yellow spark, intermittent spark or no spark at all you've got an ignition problem. (You should see a hot, blue spark each ½ revolution.). Now have an assistant hand crank the engine while observing the spark plug. Chances are you'll now get the hot, blue spark when hand cranking.

Assuming it is an ignition problem the first thing I'd do is replace the coil with a new 6 volt coil. And while you're doing that spend a few $ for new points and condenser.

Hope this helps...

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