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Thread: Mikuni carbs

  1. #1
    eddavnct
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    Question Mikuni carbs

    Bing carbs shot one didn't even take to a rebuild thinking about Mikuni VM34mm any buddy have any info. on what to do with vac. lines my bike is a 84 RS also do they run well on beemers

  2. #2
    DS74BMW
    Guest
    I put VM-26's on my '74 R60, and they work very well. My originals had no vacuum lines, but I tapped a 5mm hole in each Mikuni for a vacuum port for synchronization purposes. I had to re-jet them [idle jet, needle jet, main jet] and adjust fuel level. The rest of the conversion required new throttle cables, a pair of carb-to-cyl boots, a pair of air tube-to-carb boots, and eight clamps. I shortened the air tubes about an inch each. I removed the original choke/cables, as I have to choke each carb now.

    Stan Smith @ Rocky Point Cycles [Xenia, Ohio] sells complete conversions, although I bought my carbs at one source, and the rest of conversion from Stan.

    Some pics:





    Hope this helps.
    Richard

  3. #3
    mmmalmberg
    Guest
    Is there any awkwardness with not having a L & R version of the carb, i.e. mixture or idle adjustment screw locations etc.?

  4. #4
    DS74BMW
    Guest
    No, just something to get used to; worth the performance increase, IMO.

  5. #5
    mmmalmberg
    Guest
    Very interested - what size are they? How did they run on your RT? I have the 40mm Bings and feel like it might run better with something like 36's or 38's...
    Thanks,
    Mark
    Last edited by mmmalmberg; 09-06-2009 at 04:08 AM.

  6. #6
    Registered User donmitt's Avatar
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    Do the Mikuni carbs have the same issues as stock with the ethanol gas?
    Don Mitchell

  7. #7
    murphychuck
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    I just took off a pair of Mikuni VM 34 from a '83R100RT and they ran great! I have them for sale on the flea market. I would put up some pics,but the overseer always scolds me and takes them off.

  8. #8
    I changed the diaphragm springs on 40 mm bing carbs on an 84 r100 to the newer part (part number 13 11 1 338 134). I found the throttle noticeably more responsive. This is simple and cheap. Details here:

    http://jhau.maliwi.de/mot/r100tic.htm#carb

  9. #9
    Registered User kgadley01's Avatar
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    Quote Originally Posted by murphychuck View Post
    I just took off a pair of Mikuni VM 34 from a '83R100RT and they ran great! I have them for sale on the flea market. I would put up some pics,but the overseer always scolds me and takes them off.
    Maybe you should remove the carbs from your nekid model. I know Sex sells but.....LOL

  10. #10
    DS74BMW: Just sent you a PM... curious about the 60/6 Mikuni conversion. Thanks for posting the pics!

    MY questions have to do with changes in performance, and what jetting you ended up with..

    Thanks!

  11. #11
    Scottish Transplant Picinisco's Avatar
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    Quote Originally Posted by DS74BMW View Post
    I put VM-26's on my '74 R60, and they work very well. My originals had no vacuum lines, but I tapped a 5mm hole in each Mikuni for a vacuum port for synchronization purposes.
    Richard, I just came across your pics of the Mikuni carbs that you added vacuum port to. I need to do the same. Can you show me on more detail where on the carbs you actually tapped into. I know it was some time ago but hope you are still active here.

    Cheers........John
    2004 R1150GS 1978 R75G/S Frankenbike
    AMA - BMWMOA - BMWRSOC - AZBEEMERS
    Gilbert, Arizona

  12. #12
    Liaison 20774's Avatar
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    John -

    Not sure Richard is going to see your post. The last time he was on the forum was December 2009. Maybe he's on hiatus or is out doing something fun! You might check his profile and see if there's another way to contact him.
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  13. #13
    Quote Originally Posted by DS74BMW View Post
    I put VM-26's on my '74 R60, and they work very well. My originals had no vacuum lines, but I tapped a 5mm hole in each Mikuni for a vacuum port for synchronization purposes. I had to re-jet them [idle jet, needle jet, main jet] and adjust fuel level. The rest of the conversion required new throttle cables, a pair of carb-to-cyl boots, a pair of air tube-to-carb boots, and eight clamps. I shortened the air tubes about an inch each. I removed the original choke/cables, as I have to choke each carb now.

    Stan Smith @ Rocky Point Cycles [Xenia, Ohio] sells complete conversions, although I bought my carbs at one source, and the rest of conversion from Stan.

    Some pics:





    Hope this helps.
    Richard

    I'm not sure they {Rocky Point} Xenia Oh, are still in business ? I can't find anything that says they are.

    The one that was in Florida it seems has moved to Mass....
    Ron Prior {AMA member ,MOA member}
    Milford,Oh
    2002 KLT
    2004 Roadster

  14. #14
    Liaison 20774's Avatar
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    Ron -

    Good thinking! Yes, Rocky Point is still in business...the ownership did change, though:

    http://www.rockypointcycle.com/c-bmw.html
    Kurt -- Forum Liaison ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  15. #15
    Scottish Transplant Picinisco's Avatar
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    Not sure that this answers my question. I want to add vacuum ports to my VN32 Mikunis and was interested to see where "Richard" had tapped into to achieve this on his VN26s
    2004 R1150GS 1978 R75G/S Frankenbike
    AMA - BMWMOA - BMWRSOC - AZBEEMERS
    Gilbert, Arizona

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