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lights flickered and then bike died

Discussion in 'The Garage' started by NewHavenMike, Mar 1, 2018.

  1. NewHavenMike

    NewHavenMike 1976 XS360C

    Hello guys. Well I couldnt resist and decided to take my bike out. felt really good lol. First ride went well no problems at all.

    Second ride was a different story. I didnt plan on going for a ride, rather just going to the store down the street.. Well, I changed my mind and went for a ride anyway, keep in mind that I left my phone at home and only had $20 on me and my little double headed screwdriver that I use to adjust the fuel mix.. Well Im riding and things are going well, I decide to head toward home and Im at a light. I look down at the neutral light and I notice its pulsing with the engine idle. Bike runs fine and I continue about 1 1/2 miles.

    Then Im at another light waiting to take a left and the bike just died on me. I push it over and I have no power at all. My first thought was dead battery. Then I check whatever components I can and wires and fuses. I mess with the fuses a bit and some other stuff and then I had power again.

    I push the start button and it turns over just fine. Im not getting any spark. I tested the rectifier and its OK.

    I still use the mechanical regulator and I have a Pamco ignition. I ordered a modern fuse box in the meantime.

    I really hope its just the mechanical regulator the busted? any ideas before I replace everything?
  2. BBS360

    BBS360 XS400 Guru

    Go with the new fuse box first. Even with the tiniest bit of corrosion those old glass fuses can completely stop conducting.
  3. NewHavenMike

    NewHavenMike 1976 XS360C

    Yea I kinda came to my own conclusion after I posted this. I know its very simple. I wanted to make sure it wasnt something electrical and internal to the engine.

    I found a website that sells a rec/reg combo for the XS360. Its a plug and play part. the website is: http://www.regulatorrectifier.com/catalog/1976-1977-yamaha-xs-360-xs360-regulator-rectifier

    Anyone know of this place?

    I have a fuse box on order now but I may change my mind and get some inline fuses instead and eliminate some of the wire harness.

    Rewiring some of the bike has been on the to-do list anyways since its a mess. Theres a bunch of unused connections and length or wire that is not needed.
  4. NewHavenMike

    NewHavenMike 1976 XS360C

    OK so an update here. I made up a new fuse box and bought the combo rec/reg setup that was plug and play.

    Hook my battery up to juice and turn the key. Electrical powers up and looks like its ready to go. I check for spark and Im getting nothing. Naturally, my next conclusion is that the coils burned out. Thats an easy fix so Ill prob just get new ones anyways and have spares in case its not them.

    Next, I had a look at the Pamco unit on the side of the cylinder head. It looks like a resistor burned out on both circuit boards. I guess this could be from leaving the key and switch turned on too long but I cant seem to recall when I ever did that. Anyways, this happened on my bike when I was riding it in the middle of the day.

    I did remove the condenser as the instructions said I wouldnt need it anymore and also kept the 10 amp fuse. Should I have stepped down to a 7.5 as I have no condenser? How can I contact Pamco Pete about a repair/replacement? Ive emailed hime before but it mustve been a dead email address.

  5. spectra

    spectra XS400 Addict

    I emailed him off his website and he answered.

    He is also on the XS650 forum so maybe try there ?
  6. NewHavenMike

    NewHavenMike 1976 XS360C

    It seems he has a seperate email for every bike he makes parts for? Not sure if they all link to one account or what? He also has a website for every bike he makes parts for, sort of confusing. I emailed him through a CB email address and linked him this thread.
  7. pamcopete

    pamcopete XS400 Enthusiast

    You may have had an overvoltage condition that fried those capacitors. Try just cutting them out.
  8. NewHavenMike

    NewHavenMike 1976 XS360C

    Thanks for a response. OK i will remove them from the board. At this point should I be looking for a spark? Are they not a necessary part of the assembly? Is it only need when you still have a mechanical advance?
  9. NewHavenMike

    NewHavenMike 1976 XS360C

    Pete, I have removed the capacitors from the boards. Im not getting anything.

    Ive replaced the mechanical regulator and rectifier with a new combo unit.

    Ive tested the both coils and they are good, even bought new coils just to be ready in case they were bad.

    I bought and made a new fuse box and charged the battery up.

    What next?
  10. NewHavenMike

    NewHavenMike 1976 XS360C

    Well, I had some time today and I removed the Pamco and reinstalled the old points. It fired right up, runs rough but it starts. so its definitely the Pamco. I wonder what couldve happened if the coils didnt burn out when the Pamco burned?
  11. BBS360

    BBS360 XS400 Guru

    A short duration voltage spike could certainly blow the capacitors before the coils. Once the caps blew the coils may have been disconnected, protected by the blown caps.

    A couple little capacitors shouldn't cost too much.
    If the part #s are legible you should be able to look them up on digikey or Mouser and have new ones in a couple of days. Maybe even a local electronics shop.
  12. NewHavenMike

    NewHavenMike 1976 XS360C

    I think I found the capacitor, but its rated at 50v.. I was kind of thinking that it would be much more than 16v but i really dont know. Theres also a bunch that are exactly the same with extra numbers.

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