Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions |
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DRLMN1
Joined: Feb 22, 2005
Points: 12
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No Spark
Original Message May 29, 2005 6:17 pm |
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I'm having a problem getting any type of spark on a B/S small engine. I changed the points and condenser yesterday and checked the coil with a home made tester with a 6V battery. With that I got a spark to the spark plug. Which to me indicates the secondary and primary is working. Using a multi-meter connected to the plug wire and ground, it appears to have voltage to the plug. The point are set right and the gap between the magneto and flywheel are set. I've checked everything I can think of to check. Shorted wires, open wires, etc. The engine is a 92982, type 1704. There is no kill switch, and if there was I wouldn't be getting any voltage at the plug wire when using a multi-meter. I'm lost as to what is going on. Any help would certainly be greatly appreciated. Thanks
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DRLMN1
Joined: Feb 22, 2005
Points: 12
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Re: No Spark
Reply #2 May 29, 2005 10:54 pm |
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As I said in the post. I am not getting any spark under normal conditions. Its nothing to do with the carb. I can get a spark by using a coil tester. But that is by using a 6V battery to induce spark to see if the primary and secondary winding are working properly. I just got done changing the magneto to a known good one. Still no spark when trying to start by the pull rope. I have also tried different spark plugs. It should use a J8C, and it is brand new. Its has nothing to do with the carb. I can't get a spark. The meter says its there, but it don't come out of the plug? I agree about the solid state, but that isn't an option at the moment. The only thing I haven't changed is the flywheel, and the magnet on that appears to be fine. I have checked all the points on a known good engine with the one I am having ignition problems with and they both are the same? Anyone else have any good advice or help? Thanks again.
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DRLMN1
Joined: Feb 22, 2005
Points: 12
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Re: No Spark
Reply #7 May 30, 2005 3:52 pm |
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I have done all of what you suggested. Several times actually. Checked and re-checked. As I said in my original post, by using a multi-meter, there is voltage at the spark plug lead. Just can't get it to come out the other end. I have tried several different spark plugs, but can't get a spark out of any of them. I do small engine repair for a living since I am semi-retired, so I am working on this one for a client, so I don't have an option of throwing it out or I would. This one has me baffled. All the checks and re-checks I have done and everything I have seen says this thing should run, or at least produce a spark. Hope someone can come up with something. Thanks again.
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DRLMN1
Joined: Feb 22, 2005
Points: 12
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Re: No Spark
Reply #8 May 30, 2005 3:59 pm |
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DRLMN-1--I believe you stated that you had fire to the sparkplug. I would change it---many times it is the culprit. If it is not I hope you will find the trouble---Will No. What I said was that by using a multi-meter, I have voltage at the plug lead. If I connect a plug to the lead and and gound it, I can't get a spark across the air gap. I have tried several different type of plugs with the same results.
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DRLMN1
Joined: Feb 22, 2005
Points: 12
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Re: No Spark
Reply #9 May 30, 2005 4:03 pm |
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Remove the sparkplug and put a little gas in the sparkplug hole and put the sparkplug back on. Pull the rope a few times. If the engine still does not start, you might not have compression? If you don't have compression, the engine is not going to fire. Is it really easy to pull the rope as if you had the sparkplug off? Another thing I would check is that the sparkplug gap is set to .030 Compression or no compression. You have to have a spark first. That what I can't get. Everything I have checked, checks out fine.
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snowshoveler
tides in dirts out surfs up
Location: bridgewater nova scotia...aka the swamp
Joined: Jan 3, 2003
Points: 1261
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Re: No Spark
Reply #10 May 30, 2005 5:05 pm |
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hey folks ... snowshoveler reporting for duty. i kinda let this one go thinking that you would be running by now...however ? DRLMN1...im a master teck for briggs and certified for the rest,so im kinda lost when you say you used a home made tester with a 6 volt battery. im not gonna say it cant be done but your engine has magneto ignition not battery ignition.when you apply voltage to the coil you fry its internals. the tester made by briggs is a simple thing that connects to the coil wire and to the plug or block it has a little window in it and if spark appers in it when cord is pulled then coil is okay ,if no spark present then check points and condensor which you did.if still no spark then replace coil,please note -new electronic is cheeper than old point type it sounds like your coil is burnt but you might have come up with some new way to test them (please explain) your new points could have some anticorrosion material on them preventing contact,you could check with multi meter .you just need to check the wire coming from them to coil .check for continuity while turning flywheel by handand noting results with meter. later chris
craftsman 10/28 snowblower with tracks husky 372xpg chainsaw sachs dolmar bc212 bushsaw mondo trimmer monster tractor with trailer cheep wheelbarro and couple shovels and a partridge in a pear tree
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DRLMN1
Joined: Feb 22, 2005
Points: 12
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Re: No Spark
Reply #11 May 30, 2005 11:17 pm |
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hey folks ... snowshoveler reporting for duty. i kinda let this one go thinking that you would be running by now...however ? DRLMN1...im a master teck for briggs and certified for the rest,so im kinda lost when you say you used a home made tester with a 6 volt battery. im not gonna say it cant be done but your engine has magneto ignition not battery ignition.when you apply voltage to the coil you fry its internals. the tester made by briggs is a simple thing that connects to the coil wire and to the plug or block it has a little window in it and if spark appers in it when cord is pulled then coil is okay ,if no spark present then check points and condensor which you did.if still no spark then replace coil,please note -new electronic is cheeper than old point type it sounds like your coil is burnt but you might have come up with some new way to test them (please explain) your new points could have some anticorrosion material on them preventing contact,you could check with multi meter .you just need to check the wire coming from them to coil .check for continuity while turning flywheel by handand noting results with meter. later chris Chris, I will try to explain the tester. It seems to work okay. I've taken a 6V lantern battery, attached two leads, one to the plus side and the other to the minus side. Solder a 6V bulb to the plus side. On the engine, make sure your points are in the open position. Attach a spark plug to the plug lead and ground it. I used alligator clips. They work good for grounding. Ground the minus side of the battery to the frame. Momentarily touch the contact point of the condensor. You should see a spark at the air gap of the plug. This is suppose to indicate the primary and secondary windings in your coil are working. It didn't fry anything. I hope I explained it good enough to understand. I did this to the magneto I thought may be bad and to a known good one. I put the one in an engine and it still works fine. Back to the other one now. I did clean the points off befores I installed them. I didn't realize it before, but this engine appears to be made up of maybe three different engines. It has a gear reduction on it also. The guy uses it on his cement mixer. In my original post I gave a model number and type. Now I'm not sure what it is. Its probably at least 30 years old. He did ask me if I could find a new one one with a gear reduction on it. Anyway when I use a multi-meter, I do get voltage at the plug lead and also the electrode. Just can't get a spark at the air gap? I have a feeling it is a spark plug problem, althou I have tried several different ones. J19LM, J8, C8J, etc, etc. I have re-adj. and re-checked everything numerous times, and cannot find anything wrong or obvious that would cause this. It may be something simple as hell, but it sure has given me fits. Any help will surely be appreciated. Thanks
This message was modified May 30, 2005 by DRLMN1
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