I am assuming you need to replace the spark plug boot. I would investigate the Off/On Switch contacts and make sure they are not incorrectly configured or damaged as this could be causing the no spark situation. I checked the on-off switch and pulled the kill harness off with no success. The 2.5-5 reading is only applicable to the coil in the video which is fitted to the smaller briggs and stratton engines. Other options New and used from $12.30. A working ignition coil will give a reading of between 2.5 – 5 k ohms. My Briggs and Stratton 16hp v twin has no spark with a good spark plug and with the multimeter set on 20k ohms the magneto reads 4.82 ohms on each magneto. Typically, the ignition coil can go bad over time due to either long-term wear and tear or due to bad spark plug ignition cables. Thanks again for your help. A victa perhaps?? I have a Briggs and Stratton 4.5 hp mower. Typically a weak spark can cause a mower to shut off when it gets hot and the resistance of the ignition module increases. Does anyone know the resistance values for the coil alone between A and B A and C B and C Thanks. . If no shock, check kill switch which will, unfortunately, means removing top of engine cover. 592846 Supersedes 799651, 691060 ARMATURE-MAGNETO Used on vertical V-Twin engines 400000 series, i.e. Have had similar experience with a Briggs engine on a Craftsman mower..with kill wire removed from mower, Briggs and stratton only provide a range of between 2.5 and 5 K ohms as a working range for the coils. Other coils often have different readings. My B&S engine has just stopped working and I’ve checked the coil and I get about 2,6kohms between the body of the coil and the HT lead connector. That coil has identical test readings, I sanded all contact and pick-up areas and am testing with the kill wire plug disconnected. I don’t know what to do? 6 ohms may not be too high as the coil could be different to the original coil and may use different specs, It seems like the coil may not be the correct fit if the curvature does not line up correctly, It is best for it to be consistent and about the width of a business card for the air gap, You should try the coil anyway it may work if it has been sold to you as a replacement. You should get a decent shock, but not enough to harm you. You are correct the Multimeter is set to 20 Kohms and the Reading for a working coil should be between 2500-5000 Ohms. Removed cowling starter cover and using help provided above, removed ignition HT-lead and magneto assembly and used multimeter to check resistance off the mower; reading of 2.74 Kohms seen, so looks good. Common armature gap ranges are .006 - .010" and .010 - .014". Just hold the wire “close” to the block and look for a spark jumping from wire to block. 4.6 out of 5 stars 22 ratings. Should it be between 2,5-5 also for bigger engines? Ignition Coil Module For Briggs & Stratton 490586 491312 492341 495859 . Thanks so much for your fast reply. -Pulled up and “locked” the safety bar in place with velcro, and tried again, just in case… no improvement The ignition coil consists of a single wire wound hundreds of times around a core, and any break that occurs in the wire renders the coil inoperable. This will do two things. Flywheel magnets good and have been cleaned. Index cards of the proper thickness also work well. Set the multi-meter to the 20 k ohms setting. will this check also tell if coil is bad when lwanmower gets hot? I didn’t bother to try and check the spark and just put the plug in to see what would happen. Clearance to magnet is .010” What could I have screwed up? Place the negative lead onto the metal body of the ignition coil – again ensuring it makes proper contact. We can order you a coil if you think it would work they are a bit pricey, Upwards off $80 If I remember correctly. Yes a resistor spark plug should work fine as a replacement, I have not seen one with a resistor so I suspect they are not very common. Thread starter catfish51; Start date Sep 23, 2018; C. catfish51 Forum Newbie. Sorry to confuse you the write up had a few errors we had not noticed. Additionally the total resistance (11kOhm) is basically the sum of the partial resistances of the coil and the cap (7 4). 4.3 out of 5 stars 266. what should the voltage be at the spark plug when using a voltage meter to check the ignition coil output on most small engines, ie. This is a Craftsman Snowblower. I have replaced the spark plug. Still no spark. However this would likely only be a temporary solution as the problem causing your weak spark will probably get worse of time till the point that it no longer starts even without the resistor. a lower reading can indicate one of the windings in the coil has shorted causing less internal resistance, This would also cause failure of the coil. Or get 4-5 business-day shipping on this item for $5.99 . You set the meter on the 25 ohm range to measure 2,500 to 5,000 ohms, and then say that the coil should be between 2.5 and 5.0 ohms. For the coil I read a value of 2.79. If you do get shock. Briggs & Stratton Classic 35. Look for the reading on the multi-meter. You say you have the new cool for sale on the website but I’m not finding it when I search for coils have a link? £14.99 £ 14. I have a old Briggs and stratton 8hp (193707-0370-01)and have no spark. It’s getting gas (I checked the carb bowl) and compression, but still no spark. No spark, good magnets I believe, coil resistance readings are 2.63 K, brand new spark…ground (stop) is not touching anything, separated the wire, tried 2-3 positions coil from wheel, cleaned the wheel…. that reading is okay you should get 0 Ohms from the body of the coil to the stop switch connection. Pausing briefly to glance at my wife, who was now pointing and laughing at me along with the Police Officer too, I had to think for a moment before realising that I could use the insulated pliers to pull off the plug cap and kill the engine like that, which worked fine. Regards, If it is the ignition coil you are replacing then I cannot tell which is the best choice as we do not know the normal reading of coils for that motor. I recently purchase a new coil and got around the same reading. One has been run occasionally to keep it ready for power outages. What else should I check? jrr/@/flippers/./com. In this test, you pass a small electric current through the wire and measure resistance with an ohmmeter. We do not know the Ohm requirements for the newer Briggs and Stratton engines, Although from your analysis of the components 4kOhms seems to be an awful lot of resistance for the plug cap, It could indicate damage to the lead & cap connection and may be what is causing your issue. Is this too high? Your engine repair manual will provide the proper gap for your engine. If your plug wire has a boot covering the connector then insert one of you fingers into the boot ant then put another finger of same hand anywhere on the block. FREE Shipping on orders over $25 shipped by Amazon. Get it as soon as Wed, Dec 16. I want to buy a lawn mower. What you are saying might sound stupid but the fact is that this is about the best way to find out if anything is happening from the coil or not, especially when the spark is weak, or can’t be seen due to lighting problems, or when the wires can’t be properly secured/grounded to do the test. Motor is getting fresh fuel, no wires are frayed or grounded\ and changed the spark plug, Noticed that the magneto surfaces that “face” the flywheel magnets were quite “cruddy” with crap like dried grass(? You can run the mower with a standard cap to bypass the included resistor in your current cap. No ohm reading downstream of the resistor. I have two old lawnmowers with this setup. Then ignition is good. Thanks, Yes the multi-meter test gives a good indication of whether the coil is working or not but it is not 100% accurate. Oil has never been changed, but topped up once (I think). I’ve read some threads above and seems that new coils have a resistance of 7kOhms lead to body (excluding the cap). What should the resistance be to the left pole of the magneto? Click & Collect. I have set coil gap at .012″. Can ignition coils go bad from non-use? A reading of 2.5-5.0 Kohms indicates the ignition coil is in working order. Is there a way to check if the kill switch wires are bad, or if it will start or give spark by bypassing the kill switch? What ohm should i use? Wish I could explain it better. when bulb depressed Does this mean I have to pull the flywheel? I did the same with the carburetor, but to be honest I didn’t find much debris into either of those. $37.24 $ 37. I was kind of surfing this site and read all kinds of ways to test Magneto’s or electronic ignitions. (13) 13 product ratings - Briggs & Stratton Ignition Coil Magneto Armature 591420 793281 398593 496914. Wire A - connects to earth Wire B - connects to capacitor/points Wire C - connects to spark plug. Just for grins, I dug out the other identical generator and that had spark, but very weak orange spark. I am not familiar with the oil level switches so cannot offer any help there. FREE Delivery. I thought it would usually be infinite to the frame? One is the spark plug, the other is the condenser and the third is bare copper wire, I think a ground. Zero-turn rear engine riders with electric start, 19hp briggs & stratton with 42" mower 4.4 out of 5 stars 27. What I propose is “not” the recommended way but, in my opinion, the quickest was to test these things. I … I replaced the ignition coil with a brand new one from ereplacement parts and did a reading on the new one. -Find and disconnect kill switch wire, to rule that out… no change Attach a replacement coil using mounting screws . I don’t know what else to do. I checked the magnets on the flywheel and they were still strong enough to hold a screwdriver, but I noticed a smaller amount of black crud on the flywheel along this edge where the flywheel would pass the magneto, so I cleaned that off too with the same emery paper. Most later models use Briggs and Stratton's magnetron coils—essentially a self-contained ignition system that derives its power from the magnets on the flywheel.Testing one of these coils constitutes a relatively simple process. An ignition armature must be set at a precise distance from the flywheel. For the coil I read value 13,75. Old coil read approx 4.9 ohms using analog multimeter. Thanks. I unplugged the coil wire to the kill switch to isolate the electronics and still no spark. Finally decided to check into the ignition system. An ignition coil that has the wrong internal resistance often exacerbates this condition and leads to a poor-running engine for which you can find nothing wrong. One quick prime push and a pull and the engine spluttered and almost started, so I was pretty sure I’d sorted it. Something wrong with my reasoning? What next? If you have not tried a new spark plug I would try that first, Otherwise you will need to check for continuity in all the wires & test or replace any other components in the ignition system until you find the problem. The old (4.89 ohms) and new coil (6.19 ohms). Ignition coil secondary resistance = 5K to 10K Ohms" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Today, I measured the secondary of one of my coils (did not remove the coil from the engine) and I measured 6.24K Ohms from tower to tower. MASTER CROSS REFERENCE CHART OF COILS FOR COIN OPERATED GAMES & JUKEBOXES: Last edited October 28, 2020 Please email me with any updates! Learn How To Test A Briggs & Stratton Ignition Coil. to check the secondary resistance hook up the multimeter to the iron core and inside the spark plug boot. $32.58 $ 32. 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