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https://newyork.craigslist.org/brk/mcy/d/brooklyn-1979-yamaha-xs400/7195066697.html

Finally got a chance to put time into this today. I cleaned and sandpapered connections to the battery and then (most importantly, I think) I disconnected the grounding connection to the engine block (where I was surprised to find such a long bolt). That bolt's threads were pretty darn rusted...

Thanks a ton, rshutchinson, xschris, Big D. I'll give these a shot this weekend or next and report back.

Thanks rshutchinson. I don't have a voltmeter. But I can tell you that this happens even after it's been sitting on the battery tender overnight. I can try cleaning the terminals but would that also fix the bad/dirty ground?

Hi Folks, I'm coming into my 5th season with a 1979 XS400, my first and only bike ever. It's been a great bike, with only minor issues that I've always been able to address on my own. But now I'm stumped. Pressing electric start button makes a single "click" sound and then all electric...