ZRX1200 Carbs vs RS36 Carbs

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  • IanDMacDonald
    XS-XJ Super Guru
    • Oct 2010
    • 3932
    • Grand Blanc & Fenton, MI
    #1

    ZRX1200 Carbs vs RS36 Carbs

    Hey, Team! Dragging up an old thread, and hoping to consolidate the info into this one here. My BS34 carbs work great. But, I'm contemplating going the ZRX1200 route, as I plan to keep the bike forever, so why not treat it to some modern carbs? I understand the following:
    • The carbs need to be re-jetted
    • The carbs are not spaced perfectly, but close enough
    • The carbs need a choke kit fabbed and installed
    • The carbs need a vacuum port drilled (TAD's thread)
    My questions:
    1. What about the ACV system at the end of the carbs with the electrical connector? What do you do with that? Is there a block-off plate if you remove it?
    2. Would the RS36 carbs from the Oz site be any better or worse than the ZRX carbs, besides cost savings on the ZRX carbs?
    3. Is everyone staying with the modified single throttle cable, or did anyone go with a push/pull cable?
    TADracer oldyam80sg xschop
    Anything to add?
    1979 XS1100F
    2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.
    Tags: None
    • red bandit
      XSive Maximus
      • May 2005
      • 956
      • central michigan
      #2
      When I was running ZRX carbs I didn't notice any difference in performance or gas milage (I didn't do the vaccum port so you may gain some milage) so you really don't gain anything other than they are newer carbs and you need to do some work. But your old ones work fine so why change things unles you are just looking for something to do and that's fine. BTDT. I just left the wires hang there. The carbs fit fine. I used a manuel choke kit from the auto parts. I used the original single throttle cable and modded the carbs linkage. I did a little welding.
      79 F full cruiser, stainless brake lines, spade fuses, Accel coils, modded air box w/larger velocity stacks, 750 FD.
      79 SF parts bike.
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        • IanDMacDonald
          XS-XJ Super Guru
          • Oct 2010
          • 3932
          • Grand Blanc & Fenton, MI
          #3
          Originally posted by red bandit
          When I was running ZRX carbs I didn't notice any difference in performance or gas milage (I didn't do the vaccum port so you may gain some milage) so you really don't gain anything other than they are newer carbs and you need to do some work. But your old ones work fine so why change things unles you are just looking for something to do and that's fine. BTDT. I just left the wires hang there. The carbs fit fine. I used a manuel choke kit from the auto parts. I used the original single throttle cable and modded the carbs linkage. I did a little welding.
          Sounds like I'll stay with my carbs, and ensure they get some love in the Spring with a good ultrasonic cleaning and new throttle shaft seals.
          1979 XS1100F
          2H9 Mod, Truck-Lite LED Headlight, TECHNA-FIT S/S Brake Lines, Rear Air Shocks, TKAT Fork Brace, Dyna DC-I Coils, TC Fuse Block, Barnett HD Clutch Springs, Superbike Handlebars, V-Star 650 ACCT, NGK Irridium Plugs, OEM Exhaust. CNC-Cut 2nd Gear Dogs; Ported/Milled Head; Modded Airbox: 8x8 Wix Panel Filter; #137.5 Main Jet, Viper Yellow Paint, Michelin Pilot Activ F/R, Interstate AGM Battery, 14MM MC, Maier Fairing, Cree LED Fog Lights.
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            👍 1

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