carburetor

  1. C

    Running rich. Main jet size?

    Got a 1975 XS 650 with mikuni carbs that has been setting for 16 years. Rebuilt carbs but it is running WAY too rich. I live at 7000 ft and will be riding the bike from 5000 ft. to 100000 ft. when I go over mountain passes. Does anybody have a suggestion on what size main Jets I need...
  2. C

    Replacement Carburator

    Hello! I am currently running a pair of Mikuni BS-38. I have poor running on the right side cylinder. So I’m looking for a more modern setup or carburetors that will fit the XS 650. Do you have any suggestions of what to look for?
  3. J32

    Alternative Carburetors?

    I'm looking for alternative carburetors that are out there on the market that can be bought from the factory and with a little adjustments work on the bike without having to pay $$$$ Maybe something around the $$ to $$$ range. I keep seeing 34mm carburetors on Amazon like this one Carburador...
  4. Firestorm102389

    Help deciding between these carbs

    Stock 1982 XS650, putting it into a buggy I'm building, stock engine, other than exhaust. I've been digging into carbs, as the ones that were on the bike when I got it aren't any good anymore. Anyway, lots of information out there, but there are gaps and missing info. So here are the carbs I was...
  5. V

    A first time builders journey

    So I'm starting this thread because I hi-jacked van islander's tx quest for a daily rider thread. https://www.xs650.com/threads/van-islanders-tx650a-quest-for-a-daily-rider.60831/page-17#post-781701. Just want to give a shout out to everyone on that thread that gave me good advice on how to...
  6. E

    Quick carb verification, please.

    So just to ask because I don’t know and while I can read, I wanna be sure before I order stuff.. short background, got the bike in a box and there are parts here and there from a couple different bikes. I am sure the one on the left (or top, picture depending) is a 34 and the one under it is a...
  7. X

    BS38 Throttle Cutaway

    Hey everyone, I’m running over the carbs on my 79 special. I’ve got everything up to spec, but I am interested in how to determine my throttle cutaway. I know what cutaway is but in my manual, the spec for my cutaway is listed as #120. Can anyone tell me what this means?? cheers!
  8. jetmechmarty

    XS650SK Carburetor Jetting Confusion

    I just dismantled my carburetors. I can't remember the last time I was in them, because I don't keep records. I expect it has been twenty years or more. Here is what I found. The main jets are #137.5 The pilot jets are marked "30". My genuine XS 650 SJ Service Manual says Main jet #135...
  9. H

    BS38 Trouble

    Hey folks, I'm in a pickle with my carbs here. Just finishing up a custom build on a 73 tx650 frame with a mid 70's xs motor. I'm using the BS38's (for looks, against my better judgement). I have rebuilt and cleaned them, replaced bowl gaskets and float valves jets etc. Didn't mess with the...
  10. N

    For Sale - 1980 XS650 complete Mikuni carbs

    Off of a 1980 XS650, have been in the garage for awhile. Good shape. Asking 130.00 shoot me an offer. I can send more pics upon request. It will only let me upload 2 on here.
  11. B

    Hovering/ high idle

    Hello everyone. I've made a couple posts on here but I'm stuck again! I have a 79 special with b38 carbs and I was having issues with the engine breaking up between 2k and 3k (pods and no baffles) which was solved by adjusting my needle level to give me a bit more fuel (already replaced MJ and...
  12. B

    Engine bogs under 3k, then runs fine!?

    Hey everyone! I'm new to this whole community a appreciate the amount of help I've gotten. I'm currently putting a 79 back together and I'm to the test drive point if things. The bike idles great, and revs out normal sitting, but on the street it seems to break up under 3k rpms then run...
  13. Port

    Gas tank pressure and overflowing carbs?

    I have been chasing an issue where my carbs are leaking out of the pilot air jet on the rear of the carbs. The carbs are clean, recently rebuilt. When i fist hook them up to fuel, they fill to the right height. if i leave them for an hour or so with the petcock open and the tank about 2ft higher...
  14. R

    Replace Throttle Shaft Seals. Can See Light in Butterfly Valves

    I replaced my throttle shaft seals (following the ideas found in the comments found in this long thread). I used a small dremmel HHS cutter to remove the back of the threads on the two screws and then used a Philips head screwdriver. These screws came out flawlessly. I'm concerned that when I...
  15. authenticnovelty

    Carburetor Boot Barbs vs In Carb Barbs for BS38 Carbs and Vacuum Petcocks

    Hi All, After carefully studying the wealth of knowledge on this site all summer, I decided to create an account and open a thread hoping someone can point me in the right direction on my problem below. Any input would be greatly appreciated. This summer I picked up an early 1978 XS650E. The...
  16. S

    Wanted - XS1B BS38 carburetor bowl

    Hi; Just run in some bad luck, pilot screw is so seized, i'm unable to take it out. Now it has a screw extractor broken inside. I think it has no salvation. So I'm looking for a carburetor bowl, for my XS1B, late model; It's like the one in this thread ...
  17. nj1639

    Carb bench synch

    ipad picture quality sucks but you get the idea. Borrow two straight pins from the missus. Get them with the little do dads on the end as they're easier to find when you drop them. Here we have yellow stars. Open the butterflys and center one pin in the bottom of each opening. Close the...
  18. A

    Carb float range

    Working on my 77 standard. Noticed fuel in the drain hoses. Looked at the heights and they checked out to 24mm. Thought about raising them. With the bowls off, I inverted the carbs. At this point I noticed that one float lowered so much that the float needle almosts comes out. Flipping...
  19. Coho_303

    Wanted - Vm34's

    looking for a decent set of vm34 carbs for my build.
  20. Halloweenie

    For Sale - BS34 Carbs (OldSkoolCarbs rebuilt)

    I have a set of BS34's from what I was told was an '81, so they have the pull knob choke. They were completely redone by Rick West of OldSkoolCarbs back in 2012, but they have sat in the box ever since they were delivered. I never even got to ride them before I was forced off bikes due to my...
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