To Carb or not to Carb...?

Discussion in 'Technical' started by siinthai, Sep 18, 2008.

  1. siinthai

    siinthai Ol'Timer

    Ok lads , I need some help from the techies amongst us.
    Have a 2006/7 XR400, elec start.
    went out and bought a mikuni pumper carb to help her kick HH's 650.
    Now have a look at photo's below and help me out please.

    Notice the 2 wires coming out of the lefthand side bottom ? ok none of these on pumper. Also there appears to be a throttle position sensor on the butterfly valve, wires not in shot. SE of choke lever.

    now beside each other...I'm beside myself !

    Can i just hook the pumper in and leave the wiring disconnected ?
    Any help here ?
  2. Loading...

  3. Hua Hin

    Hua Hin Ol'Timer

  4. siinthai

    siinthai Ol'Timer

    Thats who i bought it from...gave them all the specs for my bike....the outlet from the carb to the inlet manifold is not the same size either...going to check in Aus...they have the same model
  5. KZ

    KZ Ol'Timer

    Can somebody explain what an electric cable is doing on a carb? Is it connected to a sensor? What might that be sensing, then?
  6. siinthai

    siinthai Ol'Timer

    A rash idea....but that's what I'm asking....2 sensors...1 is throttle position ie on the spindle of the butterfly valve.
    The other comes off the brass fitting at bottom....
  7. Pikey

    Pikey Ol'Timer


    Don't worry about it mate - just some emissions bollocks. Like B&T says, the carb is spec'd for your bike so just tape it up from the loom end and be done with it.

    I don't have my std carb at the house but can check that when I am next in CNX to see what wires were hanging off - I remember that it had a TPS but I just taped that up. Remember, a carb has a purely mechanical function so any electrickery is additional shite you can do without. Lob it on and let her rip!!! :D


  8. KZ

    KZ Ol'Timer

    Exacrly, a carb has a purely mechanical function. How can you check emissions at ot in the carb? Or is that part of an emission system?
    I remember yanking off all kinds of hoses and even a small pump off my CA version XR650L and plugging a hole under the exhaust header, it ran better right away. But a cable off a carb?!
  9. largo

    largo Member

    It looks like a heater plug to me, only neccesary in cold damp climes. That`ll be the UK then
  10. Hua Hin

    Hua Hin Ol'Timer

    The XRonly website says they include an adapter plate to fit the carb to the XR400 engine. Maybe they forgot to ship it with the carb?
  11. pitstop

    pitstop Active Member

    I have not heard anyone talk about jetting your carb yet, XR only is is a SO Cal Company and carb is most likely jetted for Southern California.
    Best you get a few jets/needles to play with.

Share This Page