2001 Harley Davidson XL Sportster 883 Hugger Logo
Posted on Sep 22, 2011
Answered by a Fixya Expert

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1974 ironhead, ran fine untill today, now its only firing on cylender one. I changed the plugs, wires ect.. still has same issue, BUT, if i pull number two wire off and let it hang on to the plug bairly, it will fire on number two, But only at very random times. I just had the thing built/estomoded at the begining of summer so everything is fairly new from front to back..

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  • Master 4,565 Answers
  • Posted on Sep 23, 2011
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Joined: Sep 22, 2009
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The first thing I'd do is check the points. I'm sure whoever built the engine or did the restoration replaced the points. When a set of points are installed, the breaker block, that piece of fiber that rubs on the breaker cam that opens and closes the points, wear rapidly to begin with. Check the points and set them at 0.018". The timing should once again to back to the proper setting once the points are correctly set. Then, test the primary resistance of the coil. Take the wires off the small terminals on the coil. Using a digital volt ohm meter set the meter's function selector switch to OHMS in the R X 1 scale. Put the red lead to one of the coils connectors and the black lead to the other. Your meter should read between 5 and 6 ohms for use with points. Now, if your bike has been converted to an electronic igntion, the coil's primary resistance should be between 2 and 3 ohms. To check the secondary of the coil, put the meter's selector switch to OHMS, in the R X 1K scale. Put one lead into each coil tower. The meter should read about 16.0 K to 20.0 K.

Good Luck
Steve

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