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Weird problem with Briggs engine


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  #1  
Old 09-12-2011, 04:58:01 PM
Matt S Matt S is offline
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Default Weird problem with Briggs engine

Hello. I hope someone can shine some light on this. I'm almost afraid to post due to the hopelessly simple problem this could be, but I'm never afraid to learn from someone who knows. I havew a pretty small kick-start briggs engine. Maybe an old wash machine engine. I can hold the plug wire and kick it over and I get a good juicy hit in my hand but when I attach a plug to it it will not jump the gap. I have three different plug they will all spark on my old snowblower but not on this little motor. What the heck is going on? I even made a grounding strap out of copper to hold the plug,checked it with the meter for a good solid ground and still no luck. I kicked this thing over so many times friday night it got warm. ANY, ANY replies at this point would be something fresh for me. Thanks for the help!
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Old 09-12-2011, 05:17:17 PM
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Elden DuRand Elden DuRand is offline
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Default Re: Weird problem

Matt:

There are a few things that will cause the condition you describe.

If the engine has been idle for a long time, the ignition points may be corroded. If they don't make good contact, you will get a jolt when you spin the engine but there's not nearly enough voltage to jump the plug gap under compression.

The flywheel needs to be removed to get at the points and condenser and my suggestion is to purchase both of them new. Not too expensive and you eliminate that as your problem.

After installing the points, make sure to set them to the proper gap at a crankshaft position where they are fully open.

The above should solve your problem unless the coil is bad but, since coils are pricey, you'd best change out the points and condenser and see if that fixes it.

Good luck!

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Old 09-12-2011, 05:39:00 PM
Kevin O. Pulver Kevin O. Pulver is offline
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Default Re: Weird problem

Matt, I think Eldon is right, and part of why you still get jolted is you aren't putting much of a load on the circuit going through your hand compared to asking it to jump that spark plug gap. Sometimes a spark plug will work too while you're looking at it, and will NOT spark under compression when you install it. There is more resistance to firing under compression than out in atmospheric pressure. I would say though, that you might not need new points, but just to clean up the old ones with a little emery cloth and then drag a clean rag through them (your shirt tail works well) Be sure to adjust the point gap. I Google for specs. I can never remember it. Kevin
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Old 09-12-2011, 08:30:42 PM
Doug Fye Doug Fye is offline
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Default Re: Weird problem

Matt

Another thing to check would be the magnetism of the flywheel.
If its week that will cause you all kinds of headaches.It'll spark
out of the cyclinder but not in under compression.
Doug
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Old 09-12-2011, 08:44:22 PM
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Default Re: Weird problem

Never use emery cloth to clean ignition points. It contains carbon that will become embedded in the points and cause resistance and arcing. Only use sand paper or a file of some sort. A diamond file is the best and is the only thing I ever use.
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Old 09-15-2011, 01:55:02 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Weird problem

After sanding the points, close down on a clean white business card (NOT plasticized), and drag out a bit. DO not pull completely out - stop and open points. Repeat until card comes out completely clean - no grey streaks. The reason for not pulling out completely, is as not to tear the card between the point faces. Try gapping the points at .018 or .020", or if you have gap spec, as specified. Most magnetoes are very picky as to gap settings and cleanliness! B&S points are usually set at .020"
Andrew
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Old 09-15-2011, 02:00:21 PM
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Tom Cwach Tom Cwach is offline
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Default Re: Weird problem

I have used paper money for final cleaning of points. High quality paper that does not leave flakes.
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Old 09-15-2011, 04:27:26 PM
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Gary Pflum Gary Pflum is offline
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Default Re: Weird problem

Quote:
Originally Posted by Tom Cwach View Post
I have used paper money for final cleaning of points. High quality paper that does not leave flakes.
Twenty's or Hundreds?
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Old 09-15-2011, 05:41:00 PM
Matt S Matt S is offline
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Default Re: Weird problem

Thanks for all the input. The points had a little hole in them at the contact point. Nothing like turning up the light and getting out the specs! It zaps good and blue now, runs like a top. Thanks again!
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Old 09-15-2011, 08:25:00 PM
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Tom Cwach Tom Cwach is offline
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Default Re: Weird problem

Quote:
Originally Posted by Gary Pflum View Post
Twenty's or Hundreds?
Hundreds are usually cleaner than ones. Twentys can be pretty fresh due to their use in ATMs.

I have cleaned points with a hundred.
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Old 09-15-2011, 08:38:53 PM
Windables Windables is offline
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Default Re: Weird problem

don/t forget to check that flywheel nut closely it maybe left hand threaded just sayn
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Old 09-15-2011, 10:07:43 PM
HBurk HBurk is offline
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Default Re: Weird problem

What'sa hunderd look like.
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Old 09-16-2011, 12:46:07 AM
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Default Re: Weird problem

A hundred is a stack of one dollar bills about 4 or 5 times higher than I can stack them. Bill K
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Old 09-16-2011, 09:08:19 AM
K D Redd K D Redd is offline
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Default Re: Weird problem with Briggs engine

The engine will run better it you use a thousand dollar bill to clean the point. A hundred just DOES NOT cut it many times

Kent
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Old 09-16-2011, 10:44:29 PM
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Default Re: Weird problem with Briggs engine

The general public can't get a thousand dollar bill anymore.
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Old 09-16-2011, 11:19:06 PM
oldschoolwisconsin oldschoolwisconsin is offline
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Default Re: Weird problem with Briggs engine

I ALWAYS use a file to clean points. I wouldnt recommend useing a diamond one, the little tiny pieces of diamond can actually come off and get in the points. I usually use my shirt to clean the points after fileing them too. And Ive never had a point issue afterwords.
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Old 09-17-2011, 02:02:35 PM
cheddarhead cheddarhead is offline
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Default Re: Weird problem with Briggs engine

Sometimes using a file can take to much of the points. If they need to be cleaned i use sand paper, an a file if they have to sit flat.
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