Join Date: Apr 2005
Location: North Wilkesboro, NC
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Re: 72 Yamaha DT250 not getting spark
I agree with originaldirt-the points and condensor are essentially wear items and have quite a bit of age by now. But, if you feel that you must test the coil, you can use a 12v battery to do it. Run a wire from the negative on the battery to the frame of the bike. Then, run another wire from the hot side of the coil. With a known good plug, rest the threads of the plug on the engine case. Next, quickly touch the wire from the hot side of the coil to the positive terminal on the battery and watch for spark on the plug. You must just very briefly and quickly touch the wire to the terminal to simulate the action of the ignition system. That is, touch, remove, touch, remove. You'll get the idea...