carb advice needed

  1. M

    Help with 78 special bs38 carbs please advise needed.

    Some background on the bike, it’s all stock and I recently rebuilt the carbs and synced using a digisync. Bike seems to make a “puffing” noise and die while pulling to a stop sign at near full stop. Bike will be impossible to start for awhile until I let it sit for after that. I did not set the...
  2. C

    New Carbs

    I just got new 34mm Mikuni carbs from TCbros along with their suggested aluminum manifolds. Anyone have photos of how they routed fuel lines, and suggestions on a non-vacuum petcock for my stock 1980 tank. Do I need a double petcock or can lines be tied together with fittings? I am also a little...
  3. XSAndy

    Balancing Carby without Manometer? Dead cylinder variation.

    So is it possible? I do not have a manometer. Here’s my theory and happy to have it critiqued to death. Stock XS650SH, stock pretty much everything. Points on this one in Australia. If I set my idle higher and disconnect a plug lead from each side one at a time, then change the balancing screw...
  4. Crashedkiwi

    I think I'm opening a can of worms......

    Hi All; As my project draws closer to being complete I keep on getting tempted by the shiny pics of new carbies on MikesXs. To date, I've had nothing but great service and great products from these guys - But I note that opinion seems divided on both MikesXs & the carbies here. So given...
  5. 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!
  6. Marden

    Carb elbow connectors

    I have these 90 degree connectors on my carbs. The bike is an X1 1971 but the Mikunis seems to be the ones used on the X2, I compared the numbers on jets/seats etc. with the rebuild kits on Heiden tuning ( I live in Sweden so Netherlands are the closest retailer). These little guys seems...
  7. R

    Should I Be Worried? (Pilot Jet)

    So I’ve been having some carb trouble - I think I’ve finally got it sorted out, ridiculously high idle, replaced the diaphragms/slides - and I took my carbs apart yesterday... You know that rubber piece that goes in under the pilot jet? Well after I drained my carb, it was all swollen. Why is...
  8. Port

    Intermittent backfire during acceleration

    I am trying to diagnose a strange new backfire/stumble issue i have Specs: 1981 XS650 SH with Ganzo Box ignition BP7ES plugs 0.035" gaping High output coil from Mikes Carbs are well synced Stock air boxes Stock jetting (i believe) Was running with no issue on a PAMCO before the Ganzo...
  9. SpeedMachine

    78 xs650 carburetors

    Hey guys- I’m resurrecting my 78 xs650 and have an issue where the bike has a hesitation at 3k rpms and makes a “pop” out the pod filters when I let off the throttle. Otherwise, the throttle is smooth and responsive. Any thoughts about carb adjustments?
  10. aDotInTime

    Popping exhaust, Carbon covered plugs and exhaust gaskets....Oh boy

    Hey all. So I found that there were bits of paper towel stuck in the inlet. I was able to crank through enough to get them to burn off. The issue I'm facing now is that Both (but more on the left) exhaust headers are popping pretty consistently. I had a little too much oil in the engine and...
  11. zoomoto

    Help BS38 needle jet leak

    hey guys! Long time no see. Wrapping up my winter build on my 1977 XS650 and have come across an issue i can’t correct for the life of me. I’m running 78-79 bs38s btw (yes, correct internals have all been identified and replaced upon purchase of bike) Started lean on my jetting after...
  12. Noidea

    Air leaks up the wazoo

    Hey guys back again haven’t posted here on a while been trying to just read more and answer my own question instead of repeating all the questions that are already asked, but now I’m at my wits end so here I am. I have a 73tx650 stock everything except my carbs are 76s, podfilters and step up...
  13. Bstryker

    Carbs, carbs, carbs

    Hey all! So... My bike was running decently and I wanted to mess around with it and get my idle smoother with no deceleration popping. Did a bit of research and found that it was most likely a lean mixture, though it could be a number of reasons. So I took the initiative to take off the carbs...
  14. Angry Rabbit

    Slide and Diaphragm Shaking?

    I'm in the process of tuning up my BS34 carbs following the carb bible "The XS650 Garage Carburetor Guide.PDF". I've noticed it is running a bit rough when I apply throttle. I popped the air pods off to see if that would help. When I looked in the air intakes, I was surprised to see the slide...
  15. T

    Wanted - Looking for a Carb cleaning service

    I have some BS38 carbs on my 1979 650. I’m looking to ship them out to someone who is experienced in carb work. I just need a cleaning/rebuild if needed while inespecitng. Just a little far over my head in terms of what i’m Looking for. Contact me here or at Tjpirates2014@yahoo.com
  16. IAmZen

    Newbie With Carb Issues

    *I just want to state i have searched the forums,google and youtube and have not been able to find my awnser. So i have a 1981 Xs650sh stock carb. i rebuild it. Now im trying to put it back on the motor and it doesnt want to go on. Am i supposed to put the boots on the carb or engine first...
  17. muskallunge

    Air Barb vs. No Barb: '78 Carb Holder

    Now that I've got my first chop wired and fired I'm get as much info on dialing in the carbs. It's a '78 xs650 with bs38's. Pod filters with straight pipes. Have new mains and pilots of larger sizes coming but had a question about the air barbs that would have been used or stock vacuum...
  18. Surfrat28

    Starting the bike and Idle Issue

    Hey everyone hope you guys had a nice Memorial Day weekend! Bike: I have an 79 xs650 bored out to the 707cc with a Boyer ignition system installed to give me the bare minimal wiring for a chopper style bike with a kick only setup. Issue: I do have spark. The only way I can get the bike to...
  19. kshansen

    Float bowl gaskets for 1982 XS650

    Boats .net shows them as being 3F7-14984-00-00 with shipping they are asking in the area of $20.00 each. Now searching on Ebay I see these ...
  20. A

    Mixture screw headache...

    Okay, so I have a 1978 (model year '77) xs 750 triple. I had it up and running a few months back only to find that once it got going it leaked oil from the head-gasket by the cup. Albeit, it didn't run the best, but i could at least (if it weren't for the awful leak) ride it and troubleshoot...
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