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  1. #1
    Senior Member jbfla's Avatar
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    carb flange measurement?

    Can anyone tell me the center to center distance of the mounting holes of the carb mounting flange?

    Don't have my parts or bike nearby to measure it myself.

    Thanks.

    jb

    2018 Triumph Street Twin..............2016 CB500F
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  2. #2
    Senior Member elime's Avatar
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    Not center to center but edge to edge = 2 7/16 "

    P4251302.JPG
    Last edited by elime; 04-25-2014 at 01:27 PM.
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  3. #3
    Senior Member jbfla's Avatar
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    Quote Originally Posted by elime View Post
    Not center to center but edge to edge = 2 7/16 "
    Thanks, Tony.

    2.4375in = 61.912mm

    I think the holes are 8mm in diameter, but am not sure. If I subtract 4mm from each side I should get the approx. the center to center distance.

    62 - 8 = 54mm

    Not exactly the number I was hoping for, but it will give me something to go by.

    I'm hoping to find a plug and play solution for that BW carb...still not liking the duct tape.

    jb
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

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  5. #4
    Senior Member elime's Avatar
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    If you click on the picture to magnify it you can see the white lines I drew. The measurement is right edge to right edge which should equal center to center.

    I did it again in metric. This time it is left edge to left edge.

    The left side is 51mm. The right hole measured to the left edge of the hole is 113mm. 113-51=62mm. Left edge to left edge, or center to center.

    P4251301.JPG

    The bolt hole looks to be 6mm.

    P4251303.JPG

    I even stuck a 1/4" bolt in the hole for reference .

    P4251302 (2).JPG

    I just finished painting the under side of my XT350 tank and it came out pretty bad but who cares? Plus it is raining -- can't believe rain at this late date. Oh well......Tony
    Long live the internal combustion engine!

  6. #5
    Senior Member jbfla's Avatar
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    Quote Originally Posted by elime View Post
    ...left edge of the hole is 113mm. 113-51=62mm. Left edge to left edge, or center to center.
    Tony
    Thanks Tony,

    That makes me a little more hopeful for a bolt-on solution, other than the stock TW flange.

    There is a flange for the Mikuni that the holes are 60mm on center...may be close enough... but may not even be necessary.

    Just trying to find all the options.

    jb
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

  7. #6
    Senior Member GaryL's Avatar
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    I have a 2JX mounting flange here. The holes themselves measure .275 inches, not quite 8MM. Center to center measures 2.425 inches or about 62MM.

    The metal face to the engine measures 1.10 inches or 23MM. O ring inside is 1.390- 35MM and outside is 1.560 - 39MM.

    Carb side rubber opening is 1.30 inches or 34MM. Keep in mind this is a used old style carb mounting flange.

    GaryL
    Last edited by GaryL; 04-25-2014 at 09:38 PM.
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  8. #7
    Senior Member jbfla's Avatar
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    Thanks, Gary,

    I'm just gathering info to determine if there are existing ready-made parts that will work to mount the Chinese Mikuni carb to the TW without modification.

    It may turn out to be a dead end, or my curiosity about things mechanical may kill me first.

    jb
    2018 Triumph Street Twin..............2016 CB500F
    2014 XT250 ..................................2008 H-D Softail Deluxe
    2008 SV 650..................................2007 DR 650..

  9. #8
    Super Moderator littletommy's Avatar
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    You might contact Macbig2k1 in Germany.
    Very knowledgeable Guy.
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  10. #9
    Senior Member GaryL's Avatar
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    Quote Originally Posted by jbfla View Post
    Thanks, Gary,

    I'm just gathering info to determine if there are existing ready-made parts that will work to mount the Chinese Mikuni carb to the TW without modification.

    It may turn out to be a dead end, or my curiosity about things mechanical may kill me first.

    jb
    Yeah JB, you and I went to different schools together and I know what you are thinking. Old and new style TW carbs take different boots and I would bet there are other bikes in the Yamaha line up that might have just the right boots for this application. Finding the real specs of all the various mounting flanges and boots could be a hard search unless you have the parts right in front of you. Go on eBay and you might find friendly sellers with various flanges and boots willing to do the simple measures we need.

    GaryL
    Be Decisive! Right or Wrong just make a decision. ​ The road of life is paved with flat squirrels that couldn't make a decision.

    Since light travels faster than sound, some people appear bright until you hear them speak.
    If I agreed with you, we'd both be wrong.

    1987 Yamaha BW350 Big Wheel
    2017 Snowdog Track sled tow motor for ice fishing
    Kubota BX2370 Subcompact tractor with snow blower
    Wilderness System Ride 115 fishing Kayaks

  11. #10
    Senior Member PalmStateCrawler's Avatar
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    Not sure if this helps but the top two here fit the tw. 60mm hole to hole. I purchased the second one because of the larger intake than stock on my pumper carb. I got it when I was working at cycle gear so it only cost me $12 but I'm sure you can find something similar elsewhere or order this one from any bike shop.

    '13 690 Enduro R too many frickin farkles...
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