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'79 special voltage regulator swap basic questions

Discussion in 'The Garage' started by pkovo, Apr 12, 2015.

  1. Hi Aussi, you have replaced the rectifier and are now looking at replacing the regulator? The green bit is supposed to get hot, it's dumping excess voltage, that's what it's meant to do. Did you do the charging voltage test we discussed at all?
    You would need to do something horribly wrong to fry a regulator

    cheers Mick
  2. AussiXS

    AussiXS XS650 Enthusiast

    Hey guys thanks for all the input, I'll get one of those Bosch regulators and see how they go. Mine isn't busted but I just want to have some spares so I know I am safe with a back up :). How do I tell if my bike is a TCI? I got it imported from Japan and it says on the paperwork 1978 special but it doesn't have the badges for a special. I just want to make sure.

    Mick, I bought a voltage gauge so I can keep in top of the power while on the move. Started her and ran it for a bit and the voltage was showing 13.5, whole jumping up and down a bit with revs. The battery was a bit flat so I will do a proper test when I have the carbs on and tuned.

    All my electrical issues are over now:bow2:! The carbs are next. The bowls were 24mm instead of 27mm and her lowest idle was 4rpm. Now we have a nice 800-1k rpm. :).

    My next issue is the clutch, I pop her in gear and it lunged forward and stalled right away. I did the adjustment screw in the bars all the way out and squeeze the clutch fully and no go :(. I'll read the tech section and see what's up :umm:
  3. weekendrider

    weekendrider Iron Horse cowboy

    Left side of the head remove the cover above the spark plug. Under it you will find points or nothing(TCI).
    Re: the clutch. If it hasn't been run in awhile it could be your clutch plates are sticking.
  4. AussiXS

    AussiXS XS650 Enthusiast

    So, I have found out that I have a TCI, that means my bike is a 79? I just want to confirm, are you saying the best regulator to use for a 1979 TCI bike would be VR-115?
  5. AussiXS

    AussiXS XS650 Enthusiast

    Happy days, here's hoping I don't run through the garage wall!

    I have the electrics behind the cover, so I guess i have a TCI.
  6. What sort of electrics ? Points or nothing, picture would be good :)
  7. weekendrider

    weekendrider Iron Horse cowboy

    If you have electronics it has most likely been converted from points. Post a picture.
  8. littlebill31

    littlebill31 Smells of Raw Fuel

    The TCI would have nothing behind the cover...

    Points looks like this...

  9. Thanks littlebill, I was doing the same thing....
    littlebill31 likes this.
  10. weekendrider

    weekendrider Iron Horse cowboy

    Might as well take off the right side, cover also. . . .you are going to want to know. Picture both sides.
  11. I can see him running down to the garage with a screwdriver in one hand and a camera in the other :lmao:.....

    Do you want me to chase the rectifier for you? I am going to the shop today.....

    Cheers Mick
  12. weekendrider

    weekendrider Iron Horse cowboy

    Who you talking to Mick?
    Are you asking me?
  13. Nope WER, it was me being me, but the question about the rectifier was directed to Aussi as we discussed getting one from the shop last week ...
  14. This should have been in your first post. Japanese Bikes are way different n the respect they have things on their bikes before they were on the bikes in other countries.

    Post up some pics of the bike, behind the chrome cam end covers, reg and rectifier or if it is the combined Solid state Reg/rect. all this information is needed because it could make a lot of the answers to your questions null and void and money spent could be wasted on the wrong parts.

    Frame and engine no to please. If you don't want to post the whole number leave the last 3 digits as an aster-ix
  15. weekendrider

    weekendrider Iron Horse cowboy

    OK Mick cause I was sure a little lost. I went back and read some previous posts and wasn't finding anything about rectumfying.
  16. littlebill31

    littlebill31 Smells of Raw Fuel

    Rectum? Damn near killed 'em
  17. AussiXS

    AussiXS XS650 Enthusiast

    Sorry for the late reply guys, I have been working manically on the old thing to get her ready for rego this Saturday. The clutch was stuck and I put her on the center stand and ran it to 5th gear and locked up the rear brake about 15 times and it finally came undone! She is ready for rego!

    I was doing exactly what Mick said, I ran down with a screw driver this morning but the cover wouldn't come undone. I need to warm her up to get the screws out, then I'll post some pictures.

    I did undo the cover when I first got it but I can't remember exactly what was behind it, there is a black cable running into the left side cover above the sparks. Hopefully it's already got one and it saves me buying one.

    The previous posts show what I bought. Would that be the wrong rectifier to get?
    Mick, don't worry about getting that rectifier if the last ones I bought in the previous posts works. Thanks for the help tho.

    It's Japanese, did they change them much? I did like the fact it only had 25k (kms) on the clock. My thoughts wander to a Japanese guy meticulously going over every detail of the bike before each and every ride to make sure it's just right haha.

    Attached Files:

  18. You won't pass rego without a chain guard Aussi.....revisit what Skull said about the Jap bikes, he knows these bikes backwards

  19. 5twins

    5twins XS650 Guru

    In your first post, you said you had points. That black wire running into the little housing on the left side above the spark plug would indicate you do. I don't know where you got the idea that you have a TCI. That is the factory electronic ignition. You would not have two ignition systems on the bike, you would have one or the other, points or TCI.

    Take a look at your alternator too. It's under the round cover that says "Yamaha" just above the shift lever on the left side. You need to positively identify the version of the charging system you have because that determines which regulator you need.
  20. AussiXS

    AussiXS XS650 Enthusiast

    Good shout on the chain guard! I have it covered in grease with no intention of putting it on, I will dust it off and put it on for sure :).

    I'll get loads of pics tonights, thanks for the help guys :)

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