1978

  1. RockyRo217

    1978 Yamaha 400XS one cylinder won’t run!

    Hi guys/gals. I have been using all the treads religiously and have found great help from everyone’s conversations but I’m defeated with my ‘78. I bought the bike as a project for myself throughout the offseason and was able to get the bike running but only with the right cylinder. I have had...
  2. B

    1978 Yamaha 400 Electric Start

    Hello! I’m new to this page but had some questions. I recently got a 1978 Yamaha 400. I believe it’s an XS however, the title doesn’t say and from my knowledge it was custom build found at an estate sale. It’s extremely hard for me to kick over so I’m looking at my options of converting into...
  3. S

    Xs400 weird idle issue

    Hi all, I've been fixing an old xs400 (1978 xs400f) I got a while back and finally have it registered and warranted (NZ) however I've had a constant issue that I just can't seem to fix. The bike runs well and has good power, but the revs will hang when you touch the throttle (not always) once...
  4. Monowakari

    78 xs400 outter head stud

    Hey fellas, Dug into my engine to change some leaky gaskets and upon reinstall I broke a head bolt/stud. Part # 1L9-11361-00-00 for anyone who's any good at sourcing parts. Its one of the four outter corner studs. Looking for help sourcing one cause i figured some of you may have better...
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