5twins
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    • 5twins
      That bolt size is correct, I just checked one ..... If those holes have been empty for a while, they often get all crusted up. You...
      • HeadpipeBoltThreadPitch.jpg
      • HeadpipeBoltLength.jpg
    • 5twins
      5twins replied to the thread Seat year and model.
      My buddy recently bought the hinged version from XS650Direct for his '80 SPII but it didn't fit very well. We had to modify the hinges...
    • 5twins
      There's only one o-ring in the BS38 carbs and it's the one on the needle jet, but you won't find it in any of the rebuild kits. You can...
      • Needle Jet O-ring.jpg
    • 5twins
      One more thing - those pleated K&N style pods will most likely cause tuning issues. They don't work well on these CV type carbs. Best...
      • Uni Pod.jpg
    • 5twins
      Carb kits aren't really recommended. Many come with the wrong size jets, but with your open pipes and pods, you wouldn't want that...
      • Mikuni-VM24-171-Genuine-Brass-Float-Dimensions.jpg
    • 5twins
      Since you measure your float setting with the carb upside down, a lower numbers results in a higher fuel level once the carbs are turned...
    • 5twins
      I bought my 1st set of Ferodo Platinum pads from 650Central and paid a premium price. I now find them on eBay for much less, but you...
      • FerodoPads2.jpg
      • FerodoPads.jpg
    • 5twins
      To support the wiring harnesses that run along each side of the steering neck, I install what I can a harness "sling". Yamaha was kind...
      • HarnessSlingLeft2.jpg
    • 5twins
      Yes, you need the idle speed set to 1100-1200 rpms or the bike will just randomly stall at idle. Also, you set idle speed when the bike...
    • 5twins
      Yes, that axle clamp on the left fork leg gets installed a certain way. Yes, the arrow on it's bottom should point forward but there's...
      • Axle Clamp.jpg
      • MCClamp.jpg
    • 5twins
      5twins replied to the thread 83 Special Handlebar swap.
      As most here already know, I'm a big fan of the Euro bar bend. The way they droop down slightly on the ends places your wrists at a very...
      • $200SpecialClean5.jpg
      • $200SpecialClean4.jpg
      • $200SpecialClean.jpg
      • $200SpecialClean6.jpg
    • 5twins
      5twins replied to the thread Carb Boots for Mikuni BS34.
      Try to find ARS boots as replacements. You might get lucky and find some cheap on eBay. But watch out, there are lots of cheap Chinese...
    • 5twins
      5twins replied to the thread 77D assessment..
      Here's a section from the '77 wiring diagram. You may not be able to use that 6 connector block, you may need individual bullets .....
      • 77Ign.Switch.jpg
    • 5twins
      5twins replied to the thread 77D assessment..
      Some of the older switches didn't have a connector block on them but rather all individual bullets. The '77 switch I adapted for use on...
      • SwitchPlug.jpg
      • SwitchPlug2.jpg
    • 5twins
      5twins replied to the thread Survivor Special '79 - 6737km.
      I'll mention that fuel mileage is another test for your jetting on these CV carbs. If it drops way off, it's a pretty good bet you're...
    • 5twins
      5twins replied to the thread Survivor Special '79 - 6737km.
      That's a good point. I rarely burn through the whole tank at once.
    • 5twins
      5twins replied to the thread Survivor Special '79 - 6737km.
      Yes, low to mid 40's is my usual mileage. I might get a few MPG better if I run a tank mostly on the highway but I rarely do that.
    • 5twins
      I've "tightened" the needle up in those older slides like that as well. Without the shim washer, there's a lot of up-down play and...
    • 5twins
      5twins replied to the thread Voltage regulator alternative?.
      I have voltmeters on both of mine and don't really see any difference in voltage output when revved whether the headlight/tail light is...
      • Reg Adjust.JPG
    • 5twins
      5twins replied to the thread Voltage regulator alternative?.
      Automotive charging systems like the one used on our 650s generally use one of two different types of regulators, depending how the...
    • 5twins
      5twins replied to the thread Carburetor confusion!.
      Your bike should have viton rubber tipped float needles. They are very good, don't wear much, and usually last a long, long time. When...
    • 5twins
      5twins replied to the thread 81 Clutch Same as 74 Clutch?.
      Personally, I really like the '80 and later 6 plate set-up with it's spring-loaded bottom damper plate. My '78 stock 7 plate clutch...
    • 5twins
      The neutral switch on top of the motor provides the ground for the sky blue wire when the bike is in neutral. Don't ground that wire...
    • 5twins
      What year is the bike? Because my later models ('78 and '83) don't have that ground wire to the bar mounts. They use the ground wire...
    • 5twins
      Yes, and you'll find a similar one in the lower half of the left switch housing .....
      • SwitchGround2.jpg
    • 5twins
      Yes, on bikes up to '81 (I think), the left switch housing has a ground wire running into the headlight bucket and the right switch has...
      • 83GroundWire.jpg
      • 83Plug.jpg
    • 5twins
      5twins replied to the thread Later engine in older chassis.
      No need to change the rotor, the newer style will work fine with the points. You can't go the other way - use an older points type rotor...
    • 5twins
      5twins replied to the thread So I wasn’t crazy after all….
      I always anti-seize the spoke nipple threads, haven't had any issues. I don't put it between the nipple and rim though. But, what I have...
      • RedRubberGrease.jpg
    • 5twins
      5twins replied to the thread Rubber bushes.
      Rubber on the swingarm???? I'm not aware of any, unless you mean the rubber on the pivot end caps/grease seals. Those caps are available...
    • 5twins
      5twins replied to the thread Later engine in older chassis.
      As you can see in my 1st pic, I add power brake check valves to the breather hoses and poise them over the pod filter. If any oil does...
      • Power Brake Check Valve.jpg
    • 5twins
      5twins replied to the thread Yet Another Clutch Mod. Thread.
      The longer the arm is, the less rotation of the worm you'll get for any given amount of arm travel. Less arm travel means less pushrod...
    • 5twins
      You add a gusset to the tang, which it looks like you didn't do. It will break again, lol .....
      • Braced Stand2.JPG
    • 5twins
      5twins replied to the thread Getting Her Going.
      You have the crimped down lip, I see it in your pics. You have to get something under that and pry it open. Many of us use a paint can...
      • SmoothFlatNosePliers4.jpg
      • SmoothFlatNosePliers3.jpg
      • PaintCanOpener3.jpg
      • PaintCanOpener2.jpg
    • 5twins
      5twins replied to the thread Front Master Cylinder..
      You'll need to determine the bore size of the MC you've got then decide if replacing it will make things better. The 14mm MC that came...
    • 5twins
      5twins replied to the thread Later engine in older chassis.
      Yes, get UNI straight foam pods, they work the best with these CV carbs. For the BS38, you'll want the UP-4200. No need for the special...
      • Uni Pod.jpg
      • UNIsOiled.jpg
    • 5twins
      Technically, the H is the '81 model. Don't know why that chart lists it as 80-81, maybe because they started building them in the last...
    • 5twins
      Well yes, if you want to see both drain plugs, you'll need to look at two different diagrams, lol. The "Oil Pump" diagram shows the one...
    • 5twins
      5twins replied to the thread Gas leaking.
      Yes, keep using those, but you need to oil them. K&N makes special oil for them and, as mentioned, you can get it at most auto parts stores.
    • 5twins
      Marty, your link is coming up as invalid.
    • 5twins
      5twins replied to the thread Gas leaking.
      Show us what you have now. K&N, an aftermarket air filter company, makes nice airbox replacement elements. They work well but are quite...
      • AirboxK&Ns2.jpg
    • 5twins
      Yes, as Skull said, the '78E model is very nearly the same as the '79F. Only differences really are the seat profile and paint. I've...
    • 5twins
      5twins replied to the thread Gas leaking.
      For your BS38 carbs, you will want the UNI UP-4200 or UP-4200ST (dual layer). You don't want the "AST" one, it has an angled flange...
      • Uni Pod.jpg
    • 5twins
      5twins replied to the thread Cam Chain Guide.
      OK, if you want to enable the handlebar on-off headlight switch full time and do away with that headlight auto-on feature, just unplug...
      • HL Switch Relay.jpg
    • 5twins
      5twins replied to the thread CLUTCH PUSH ROD.
      The male part of the worm is metal on all of these. The female part is the plastic or nylon part.
    • 5twins
      5twins replied to the thread CLUTCH PUSH ROD.
      The only drawback to moving the clevis farther out like you did is less clutch plate separation. You won't know if this is an issue or...
      • Pushrods2.jpg
    • 5twins
      5twins replied to the thread Problems..
      You said you cleaned and lubed the advance unit but did you clean and lube the advance rod bushings in each end of the cam? They need to...
      • GreaseGrooves.jpg
      • GreaseGroovesFilled.jpg
    • 5twins
      5twins replied to the thread CLUTCH PUSH ROD.
      Some have been able to pull the ball bearing and inner rod out through the pushrod seal with a magnet but I've never been so lucky, lol...
    • 5twins
      Yes, that drain bolt w/ barb will fit the 1980 BS34 bowls.
    • 5twins
      For the past several years, I've been using Chrome Batteries, reasonably priced and free shipping ..... https://www.chromebattery.com/
    • 5twins
      Yes, proper level is where the bowl meets the lip on the body, on the 650 BS38's calling for a 24mm setting anyway. The bowl extends up...
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