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Re: OT: 1971 Briggs and Stratton Ignition

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Hec in Omaha

12-31-2012 08:36:03

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Thanks for the response. I have found some posts that say you have to repolarize the flywheel magnet to make it work.


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12-31-2012 09:43:31

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 Re: OT: 1971 Briggs and Stratton Ignition in reply to Hec in Omaha, 12-31-2012 08:36:03  
To re-polarize a magnet would be like turning it upside down. I have in fact taken the newer type mag with the built in electronic ignitions and used them many times. The gap you where given sounds way to much to me. When I set them I use a piece of plastic from one of then hard to open pack you get parts etc in to set the air gap. Our I buy one of those add on chips for around $15 that you simple put in place of the points. I have an old Murry lawn tractor that the deck has long since fell off of that I used one of those chips and and it ran the last time I tried to start it. It is dated 1967 by the way

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12-31-2012 09:14:16

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 Re: OT: 1971 Briggs and Stratton Ignition in reply to Hec in Omaha, 12-31-2012 08:36:03  
not sure I understand "repolarize the flywheel magnet "

It is a permanent magnet? all the B&S flywheels of that era are/were magnets placed in the flywheel - so you aint gonna fix that ! I too think .10 is a weee bit big!!! When I set the coil, I would take a dollar bill and fold it once and slide it in,rotate and put bill back in pocket! I suggest you do that too.

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12-31-2012 12:06:55

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 Re: OT: 1971 Briggs and Stratton Ignition in reply to Jubilee85(VA), 12-31-2012 09:14:16  
I have use many of them with no problems.

That gap sounds too big.

I think mine came with a piece of paper to set the gap.

Same flywheel is used for either. You don't have to to anything with the magnets.

Put a piece of printer paper between the new unit and the flywheel and tighten it down and then remove paper and give it a try. Make sure the wire coming from it is not grounded.
This post was edited by McBride at 12:19:54 12/31/12.

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Jason S.

01-01-2013 09:11:41

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 Re: OT: 1971 Briggs and Stratton Ignition in reply to McBride, 12-31-2012 12:06:55  
Per the Briggs shop manual the air gap is .010 to .014. It also states that the flywheel but turn at 350 rpm"s minimum to get the magnetron to fire. I worked in small engine for around 10 years and once I did come across a briggs and stratton flywheel that had a weak magnet. Only one time did I ever have that happen. It had very little spark and nothing would change it. I swapped flywheels and changed nothing else and it had the good purple spark.

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