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2 questions: one for rear grab bar & carburator diaphragm

Discussion in 'The Garage' started by 73TX650blueflake, Jul 31, 2020.

  1. 73TX650blueflake

    73TX650blueflake XS650 Member

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    My '73 TX650 needs new diaphragms so I contacted JLB Industries which makes these thin membranes but need to know what carburetors I have. My service manual reads BS38 x 2.....but doesn't read Mukoni. I thought most early Yamaha's if not all had Mukoni! The cover over my diaphragm reads "Solex". So need some assistance so I don't waste time ordering the incorrect membrane.
    Also the Partzilla diagram for this bike shows a rear grab bar/passenger handle (photo attached), but mine did not have this. I know '72 had these vertical bars, but have yet to see one on a '73 or '74. Just looking for someone's expertise on this extra piece of chrome.
    My actual "grab bar" on the side of the seat (which helps place bike on center stand) is crusty, so also looking for a location in the states that does re-chroming....any suggestions?
    Thanks & happy riding all.
     

    Attached Files:

    Last edited: Jul 31, 2020
  2. 73TX650blueflake

    73TX650blueflake XS650 Member

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    Above should read JBM Industries (not JBL)….sorry....in most cases the diaphragms are under $20/carburetor.
     
  3. txxs

    txxs XS650 Addict

    Hi, The 73 TX650 did not have a rear grab bar. The 73 seat is a one year only.
    73TX650-seat.png
     
    Boog and lakeview like this.
  4. 73TX650blueflake

    73TX650blueflake XS650 Member

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    I didn't think so "txxs". Was this handle for the 70, 71 & 72 only??....of course I found one for dirt cheap too.
    Did this mount to the seat pan or the rear chrome fender (just curious)? Thanks for the illustration...very helpful.
     
  5. txxs

    txxs XS650 Addict

    It mounted to the underside of the seat pan on the 70, 71 & 72
     
  6. 73TX650blueflake

    73TX650blueflake XS650 Member

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    Ok...I will check when I get to the shop this afternoon. I'm guessing my seat pan will not have any mounting holes present. What year is your XS650? Do you need a grab handle? Happy Friday.... (Bob)
     
  7. grizld1

    grizld1 Grumpy old man Top Contributor

    Nope, you don't have Mukoni carburetors. All XS650 carburetors were made by Mikuni. The original BS38 was designed by Solex, a French manufacturer, and produced by Mikuni under license, so early BS38s have Solex castings in the carb tops.
     
    Jim likes this.
  8. 73TX650blueflake

    73TX650blueflake XS650 Member

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    Thanks for that info, "grizld1". Yes mine reads Solex as well....now I need to locate to model on the JBM site to see if he has BS38 sized diaphragms.Good luck to me......again thanks....resurrecting this TX650 beast has been nothing short of a challenge.
     

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