studly256 Posted April 25, 2007 Share Posted April 25, 2007 I have a 1979 1100 XS My problem is (No Spark). I replaced with new the following parts so far and still No spark. Ignition Key Switch Coils. Complete wiring Harness. Been thinking about replacing the ignition unit (Black Box )thats located under the seat mounted on the frame. But,was told that the ignition unit hardly ever goes bad.Was told that the cycle shop can sell me one .The cycle shop said (but why should I sell you something you don't need). I'm getting power to the coils. I only get spark at the end of the last stroke everytime I crank it over.Sparks once. If I hold one of the spark plugs while touching metal on the bike I get spark. Seems to me,It sounds like a groung problem. I'm begging for some feed back? Link to comment Share on other sites More sharing options...
yamadoger Posted May 20, 2009 Share Posted May 20, 2009 clean of your battery ground at the frame. fix wires on vacum advance. the advance wires tend to stretch and break internally on these, so if the bike is running just tug on either of the two wires, and engine revs should be noticeably different Link to comment Share on other sites More sharing options...
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