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Looking for advice

Discussion in 'The Garage' started by Stick14ya, Apr 7, 2021.

  1. Stick14ya

    Stick14ya XS650 Member

    I have a 1977 Yamaha xs650 and I was looking for some advice from you pros I bought the bike and it hasn’t been started yet and the guy I bought it from haven’t started he just gave up on it .I checked the compression about 120 on both cylinders.My question is I’m wanting to do away with the points and condenser system if I buy the mikes xs advancer and the dual output single coil is that all I have to do away with the points system.Thanks for any advice
    MaxPete likes this.
  2. hovel

    hovel ol' stupid XS650.com Supporter

    The "points and condenser system" may not have anything to do with the reason the bike won't run. Clean and adjust the points, get the bike to run and THEN change out the system if you'd like. Don't fret the slightly low compression, it may get better as the engine runs and oil gets circulated throughout. Personally, I think you can do better than stuff from Mikes.
  3. Machine

    Machine Race the wind Top Contributor

    77 XS650 is a very cool bike the way it was originally. I'd attempt to keep it close to original.
  4. Stick14ya

    Stick14ya XS650 Member

    Thanks for the replies I have another question you guys might be able to answer I have a set of carbs that came with the bike the guy said they was 34mm not the 38mm that was with that year.My question is kinda two part I’m new to the bike building I’ve rode since I was a kid but never messed with the build aspect.So my question is where is the best place to find the intake boot that the carbs go into the block at and also if I get that installed and get the fuel to it can I just kick start the bike to see if I can get it going thanks Chris
    MaxPete likes this.
  5. ippytattoo

    ippytattoo Just another grumpy old hack.

    We need more info than 34mm. There are lots of 34mm carbs out there. Pics would be really helpful
  6. Stick14ya

    Stick14ya XS650 Member

    I’ll have to get the pics when I go to my garage and I’ll post them thanks
  7. Stick14ya

    Stick14ya XS650 Member

    Hold on I do have a pic that I took when I was trying to find out about them I think the guy I bought the bike from said they was from a 80 something xs650 looks like a milkinu or something you have to zoom on the pic thanks

    Attached Files:

  8. azman857

    azman857 '80 XS 650SG Rider XS650.com Supporter Top Contributor

    Those are BS 34's Used on 80- XS's. 81- have a drain screw on the float bowls. Good carbs.
    MaxPete likes this.
  9. RustiePyles

    RustiePyles Semper Fortis XS650.com Supporter Top Contributor

    The BS34 carbs you were supplied with are better than the BS38's that came on the bike. Those are the carbs the Yamaha switched to in 1980 so they are perfectly suitable for the bike. You will need the corresponding BS34 intakes to bolt to the head though. With few exceptions aftermarket ignitions tend to very expensive and not as robust as the OEM systems. If It were my bike I would keep the points, others will vehemently tell you that you "the ignitions and charging system are the weak link on these bikes" :bs:despite the fact that they have worked perfectly for 40-50 years. Points/condensers are cheap and robust. A very quick search of this forum will produce weekly posts all to the effect of "aftermarket ignition, bike wont run, please help!" many tend to be very long threads that result in the purchase of yet another aftermarket ignition because the first one didn't work. The ones that do work often exceed the initial cost of the bike.
    grizld1, MaxPete, Jan_P and 2 others like this.
  10. Rasputin

    Rasputin XS650 Addict XS650.com Supporter Top Contributor

    If everyone replaces their contact breaker systems, the dark art of setting them up will be lost forever.
    Almost makes me want to reinstall points on my bike.
  11. RustiePyles

    RustiePyles Semper Fortis XS650.com Supporter Top Contributor

    Yeah, I'm not trying to say that OEM systems are ALWAYS better than aftermarket, I'm just saying the cost:benefit of aftermarket is not always favorable.
    grizld1, MaxPete, Jan_P and 1 other person like this.
  12. Stick14ya

    Stick14ya XS650 Member

    I think I’m going to try to keep the points on the bike.I bought a book and can’t understand something on one page the diagram shows one condenser and two coils and on another page it shows two condensers and two coils should I have a single condenser on two coils.I’m getting confused on the wiring as i am a dumb a$$ when it comes to electrical.I can build you a house but when it comes to wiring it up I’m lost .This is the diagram I’m using to try to get the bike started then go from there to see what i have to do to getbit running right.

    Attached Files:

  13. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    OEM is a condenser "pack." it's 2 condensers soldered together back to back. Condenser grounds itself... two wires, one to each ignition side.
    MaxPete likes this.
  14. hovel

    hovel ol' stupid XS650.com Supporter

    I think the boots can come from
    Though I have no personal experience with them. One way or the other, get the bike connected to a 12V power source, have good fuel flow and kick the livin' daylights out of it.
  15. Stick14ya

    Stick14ya XS650 Member

    Ok so now I have to find another condenser because I only have one that came with the bike and now to find another wiring diagram lol
  16. RustiePyles

    RustiePyles Semper Fortis XS650.com Supporter Top Contributor

    Those condenser packs are getting hard to find/expensive, Common motor makes a little bracket to use two individual auto condensers like this but I've found that just mounting two individual condensers (as long as the little bracket is sufficiently grounded) works just fine.
  17. Stick14ya

    Stick14ya XS650 Member

    Ok thanks rusty
    RustiePyles likes this.
  18. Stick14ya

    Stick14ya XS650 Member

    Hey rusty got a question on something maybe you can answer it .Somebody has all ready started cutting the frame when I bought the bike and I guess I’m going to hard tail it or make it a brat style do you know if visual impact still makes the brat kit I tried to research it but can’t find nothing thanks
  19. 650Skull

    650Skull SSSSSSSSSlither Top Contributor

    Pays to post pics. Sometimes a description is confusing..........very, very seldom will you find the XS650 condenser pac has been broken up. They look to be one condenser with one wire that divides into to pigtails.

    XS77D Canada Parts manual  Condenser 2 copyright.jpg

    Best way to determine the difference between BS34 carbs and the BS38's is the caps. 38's have alloy tops and 34's have chrome.
    grizld1, MaxPete and Jim like this.
  20. MaxPete

    MaxPete Lucille, Betty, Demi & Gretel: I ask, THEY decide. XS650.com Supporter Top Contributor

    My advice is to get a shop manual. They can be downloaded and printed for free (sorry, I don't have the linky - but someone will).

    Setting the ignition points is a simple step-by-step process requiring a couple of simple tools and a bit of patience - but it is NOT that complicated nor does it need to be repeated very often. The process is well-explained in most manuals and the bike will run great once you do that job - and get the carbs sorted out.

    Compression of 120 psi / side is very good and as was pointed out above, it will likely improve with use.

    ...oh, and welcome to XS650.com from Canada's sunny southern coast in Windsor, Ontario!


    ...just one request - don't cut the bike up until you have ridden it. An XS650 Standard (like yours) is becoming a bit rare and they are absolutely one of the nicest bikes to ride - in stock form.
    grizld1 and Jim like this.

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