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Search results

  1. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    Me too. I really thought I'd isolated it to the carbs and that I'd find a nice nasty glob of crystallized ethanol jamming up a couple jets, or that something horrible and green would waft out into the ultrasonic bath. At the very least, I won't have to find out what mischief loose fuel...
  2. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    Yes. I want to say this as politely as possible: I do appreciate all input, but in case it comes up I am not interested in playing the "did you clean the carbs? you did? you must not have done it right, do it again" game that I've seen happen in a lot of these threads, so let's head that off...
  3. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    The throttle sync before I took it apart was good, and I don't think that would have suddenly changed for the worse in the first place. You did mention the mechanical advance; I'd checked it previously and it was good. I'll give it a look next time I have the cover off. Still hoping when I get...
  4. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    Alright, carbs cleaned and going back together. On the whole, very clean. The only things I've found: - Two of the little fuel filters that sit on top of the float valve seat were missing; the other two were out of position, sideways in the passage. I've removed those two for now. This seems...
  5. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    One thing before I start firing up the ultrasonic tonight or tomorrow - is it recommended to clean and/or spray the little hole in the bottom of the slide? There's a whole hell of a lot of plastic and rubber there and neither ultrasonic baths nor carb cleaner can be a good idea there. But it...
  6. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    Also it's not the pilot screw, it's the idle speed adjusment screw. Hard for me to take a good picture of, but it looks like it was snapped/cut about midway of the actual screw and then welded back together. Can't imagine that impacts anything but does indicate a certain slapdash approach on the...
  7. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    ​ Good timing, I pulled the carbs and started disassembling them for cleaning today. The only thing out of the ordinary so far is that the diaphragms seemed a little eager to pop off with the caps, and all but the one on #4 seemed to come off VERY easily in one particular segment of the seal...
  8. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    I mean I do feel like I've gotten pretty lucky. I've wandered around blind in the dark and in my stumblings managed to knock over enough underlying issues to turn a problem that's hard to reproduce in neutral, let alone diagnose, into what seems (in the light of day) a pretty obvious case of...
  9. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    Photo #2 for the above.
  10. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    I've had some (probably very temporary) positive, strange outcomes and I have very little clue why. This is going to be a detailed post with many things that are probably irrelevant because I have no clue what action caused what, and hope laying it all out here will let someone more experienced...
  11. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    Sorry, don't believe I explained that quite right. Before new spark plugs: hard (or finicky) to start cold, a little finicky to start hot, ran and rode nicely - but didn't seem to want to get above 6 or 7k when I opened it up; not sure what throttle position that translated to. After new spark...
  12. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    Redid the valve clearances (took me much longer than I want to admit) and reseated the airbox boots a tiny bit better, along with a couple other small things I'm probably forgetting. That work yielded... a refusal to rev above quarter-to-fifth-throttle. Which I'm actually counting as progress vs...
  13. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    Good news: nothing wrong with the coils, and I'm getting consistent readings on the coils. The installed caps were 10k ohm and at least one of them seemed to be dead - couldn't read any resistance/continuity over it. I installed 5k caps and am now getting a good 23k. I do think there *was* some...
  14. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    The mechanical advance was the first thing I checked when it was having trouble at 6k - it was in perfect order, which was unfortunate because I was SURE it'd be seized and I'd have found the root cause. I don't think the stock caps or recommended plugs are resistor - are you suggesting I...
  15. S

    1981 Suzuki GS650G - dies under load when throttled past ~1/3

    My bike had trouble pulling above 6k - which was seemingly fixed for a while with new plugs - and now sputters and dies under throttle with nearly any load (it can rev to the moon in neutral, or with the clutch pulled in). Mercifully the aftermarket reg/rec and stator from the previous owner...
  16. S

    Shim kits for valves?

    Z1 now has 29.5mm shims back in stock after a couple months of them being out, $5.25. Chapmoto sells them in specific sizes in packs of 5 for $43 (so about $8.60 each). Just before Z1 restocked I took a punt on ordering some from this Italian place for approximately the same price as Z1.
  17. S

    Installed Progressive front springs on a 1980 450S? How big of a spacer did you need?

    That's what I assumed re: the damping rod, thanks for confirming. I figured the Progressive instructions are referring to a small section of spring some bikes have above the damper, not the one on the damper itself. I understand I might need to finetune spacer length once the springs arrive. I...
  18. S

    Installed Progressive front springs on a 1980 450S? How big of a spacer did you need?

    That's exactly what I'm going for to start with; on the videos I can find it seems that the stock springs are either at or just above the top of the fork tubes (i.e., where I want the new springs to be) after the caps come off. That's why I want to know the actual (unworn, unloaded) length of...
  19. S

    Installed Progressive front springs on a 1980 450S? How big of a spacer did you need?

    I'll be ordering a pair of Progressive front fork springs (item number 11-1109) for my bike soon. The documentation I can find says you'll need to cut some PVC or similar to length to act as spacers inside the tube. I'd like to have that done before they arrive so I can make the process as fast...
  20. S

    1980 Suzuki GS450S - Identifying the idle mixture screw

    Thanks for the confirmation. The issue you mention -- busted screws -- is actually why I wanted to play around with the idle screw before popping open the carbs - wanted to gauge likelihood of busted brass to see if I needed to hunt down OEM brass in addition to rubbers for the clean. Hanging...
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