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Tractor Talk Discussion Forum

Briggs and Stratton

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Matt Kane

08-19-2006 15:32:19




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I have an old briggs and Stratton motor on my log splitter. I would say a pre "63 with the 3 legged armature on the ignition coil. Around 10 years ago my dad used it, was coming home, and lost the splitter going down the road, It ran that day. When it hit the ditch it busted off a stud for the carb. So I pulled it out the other day (10 years later), and fixed the carb, and the motor will not start. I cleaned up the flywheel and coil, but it seems like its getting a weak spark. When I hold the plug wire and turn it by hand I get a little shock. Anyone got any tips, or ideas? I need to get the splitter going again. Thanks.

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Oliver in SC

08-20-2006 02:40:28




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 Re: Briggs and Stratton in reply to Matt Kane, 08-19-2006 15:32:19  
Matt, let us know when you get it back together and hopefully running. A lot of interest here. Thanks.



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in-too-deep

08-19-2006 18:27:14




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 Re: Briggs and Stratton in reply to Matt Kane, 08-19-2006 15:32:19  
If the armature has 3 legs, it doesn't have a points or condensdor. The middle leg takes care of that. At one time it could've been upgraded to electronic ingition, or is new enough that it was installed new. If you "Magnetron" anywhere on the engine, that'll tell you that it is electronic ignition. There won't be anything beneath the flywheel. To set the gap for the flywheel/armature, use a notecard if you don't have a non-magnetic .010 (ten-thousandths) feeler gauge. Don't try to use a regular steel feeler gauge because it will be attracted to the magnets and won't give you an accurate feel. If you've got any more questions shoot me an email and I can try to give you an answer. Good luck.

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in-too-deep

08-19-2006 18:35:27




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 Re: Briggs and Stratton in reply to in-too-deep, 08-19-2006 18:27:14  
Sorry, email is cb_biker100@hotmail.com



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Coloken

08-19-2006 16:52:51




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 Re: Briggs and Stratton in reply to Matt Kane, 08-19-2006 15:32:19  
All the other things mentioned, but one I have supected some time helps. Weak spark- i some times place the coil out in the hot sun a couple of days or dry it out in the oven, Seems to help.



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Matt Kane

08-19-2006 16:35:26




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 Re: Briggs and Stratton in reply to Matt Kane, 08-19-2006 15:32:19  
Thanks for all the good ideas. Hopefully tommorrow I will have the engine mounted back on and running! Or knowing my luck it still wont run.
I have checked everything but the points and condensor. Once again thanks.



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Old Pokey

08-19-2006 16:28:07




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 Re: Briggs and Stratton in reply to Matt Kane, 08-19-2006 15:32:19  
Did you replace the plug? Sometimes a spark plug will "gas foul" when sitting for a long time. The insulator material will absorb a small amount of fuel and the spark will not fire at the correct time. For some reason we"ve had this problem more with the honda motors than the briggs, but it still happens.



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Matt Kane

08-19-2006 16:18:34




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 Re: Briggs and Stratton in reply to Matt Kane, 08-19-2006 15:32:19  
I already tore down the carb and cleaned everything before even trying to start it. I have tried a little either, and a little gas in the plug hole and nothing. Ill have to try an electric module to see if that works.



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Oliver in SC

08-19-2006 16:09:47




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 Re: Briggs and Stratton in reply to Matt Kane, 08-19-2006 15:32:19  
I've overhauled a few of these older engines. They will usually run even with a weak spark. Does it sputter or even try to start? Let's assume you have decent compression (no stuck valves), and the flywheel key has not sheared. If the engine hasa been sitting for 10 years, your problem is likely in the carb bowl. Thats where your jets are located and are probably gummed-up. Try spraying carb cleaner in all the orifices. And check the needle valve. Try a new spark. If you need further info, shoot me an E-Mail. Good luck with it.

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Glen in TX

08-19-2006 15:59:44




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 Re: Briggs and Stratton in reply to Matt Kane, 08-19-2006 15:32:19  
Most of those old B&S like that have either points under the flywheel or the larger engine has points under a rectangular cover on side of engine. Go to you local small engine shop along with the model and type numbers off side of air shroud or tag and tell them you want a Omega electronic module for it. Simple to install and you don't have to remove the flywheel to do it. Just cut the wire that goes from coil to points and splice it to the electronic module wire and ground the other wire or the module good to the engine. If it still doesn't spark you may have to reverse the wires and polarity of the module. They cost about $10-$15 and work good.

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jones in texas

08-19-2006 15:50:00




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 Re: Briggs and Stratton in reply to Matt Kane, 08-19-2006 15:32:19  
Be very careful removing the flywheel to not demage it. Use a special puller if possible.Might be able to make one from a flat steel strap by drilling two holes for puller bolts .



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Matt Kane

08-19-2006 15:46:10




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 Re: Briggs and Stratton in reply to Matt Kane, 08-19-2006 15:32:19  
There are points what Do I have to do to get to them? Never worked on an engine this old.



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old

08-19-2006 15:34:56




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 Re: Briggs and Stratton in reply to Matt Kane, 08-19-2006 15:32:19  
It may need the points cleaned and or replaced. If its that old it will have a set of points and they will be under the flywheel. And from what you say thats probably the problem



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ford-s

08-19-2006 16:17:11




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 Re: Briggs and Stratton in reply to old, 08-19-2006 15:34:56  
it sounds to me that it is the condenser.take the f/w nut off,get a long screwdriver,slide it between the block,and f/w and pry up slightly,with a SOFT headed hammer strike the end of the crankshaft,the f/w will come loose.as you reassemble it check the gap between the magneto,and f/w magnet,.015-.018.you should get good fire then.a nice blue spark.



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old

08-19-2006 17:20:06




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 Re: Briggs and Stratton in reply to ford-s, 08-19-2006 16:17:11  
Could be the condenser but more likey to be the points. BTDT and even did that type of work for a liveing at one time. Points being bad will cause you to get a shock but still not enough to make a spark at the plug. If the condenser is bad not likey to get any spark on one of them old engines

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UncleTom

08-19-2006 17:27:58




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 Re: Briggs and Stratton in reply to old, 08-19-2006 17:20:06  
I would use some fine emery on the points and polish them up and set them at .020 .Make sure that they close and open. Like in above posts it could be condenser but rarely and new plug if it is black in the porcelin area.



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Gerald J.

08-19-2006 18:36:41




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 Re: Briggs and Stratton in reply to UncleTom, 08-19-2006 17:27:58  
Emery is the worst possible thing you could use for contact points because its conductive and could stick in the points but not so conductive it will make them conduct good. A point file is the proper tool.

Gerald J.



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