Shynon 7,476 #1 Posted April 5, 2015 Built my k161 for my 704 and I have no spark. Can I test the magneto coil and if so how? Thanks for your help Tom Share this post Link to post Share on other sites
Terry M-(Moderator) 2,212 #2 Posted April 6, 2015 Hmmm....I thought for sure somebody knowledgable would chime in on this.....maybe you can,t test these coils. I'd Double check everything else first Tom....which I'm sure you have..I've been down this road myself trying to figure out if it's the coil or not. Tried asking the local small engine shops and they say it's hard to test a coil by itself. Unless you have he expensive testing tools/equipment,or you bring them the whole engine(which I,m sure they'de charge you dearly for). Too bad you don,t live closer...I,d just let you borrow the coil off my k161 to test things out. A couple years ago, Andrews lawn ranger engine just stopped having spark. I checked everything to see if I could figure it out....then when i started a thread on the subject, somebody said " sounds like your coil is bad". , so I just replaced it and.....that's what it was. Wish I could help more.... :) Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,393 #3 Posted April 6, 2015 Measure the resistance in the primary winding from the coil wire to the engine ground. May be 5000-6000 ohms. Remove the wire from the points or make sure the points are open with the ignition key on - measure the resistance from the ignition wire to ground. May be .5 ohms (1/2 ohm) to 2 ohms. Now measure from the coil wire to the ignition wire. Should be 5000.5 ohms (5000-1/2 ohms) to 6002 ohms - the two above added together. These values are a guess but checks the continuity. The secondary insulation could be breaking down and the spark is not leaving the coil. Today's insulation is better quality. Have you cleaned and recleaned the point contacts? If they don't make a good connection no spark. Garry Share this post Link to post Share on other sites
