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Thread: TB42S Straight Petrol Won't Rev Past 3000RPM - HELP

  1. #11
    Legendary dom14's Avatar
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    Quote Originally Posted by Irish View Post
    I took from his post that he didn't have the engine running when looking into the carb and manipulating the throttle, from this:
    Yeah, I think that was the case.

    I uploaded a couple of videos on below thread,showing the operation of this Nikki carby primary and secondary valve operation.

    http://www.nissanpatrol.com.au/forum...l=1#post706761

    RB30 & TB42 Nikki carbies are essentially the same.
    They are either tuned differently or jetted slightly differently to suit each engine.
    The replacement Nikki carby for sale on ebay is listed as suitable for both engines.
    A good indication that it's the same carby external and internally.
    Last edited by dom14; 16th December 2016 at 08:18 PM.
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
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    There is one maybe that could be my problem as the second one was blocked

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    The linkages were sort of seized at first until I got some lube onto them but they seem ok now but I'll go back and make sure everything's in order but I can open the secondary using the linkage that directly operates it but pulling the throttle cable only opens it slightly

  5. #14
    Legendary dom14's Avatar
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    Quote Originally Posted by CarbyLife View Post
    The linkages were sort of seized at first until I got some lube onto them but they seem ok now but I'll go back and make sure everything's in order but I can open the secondary using the linkage that directly operates it but pulling the throttle cable only opens it slightly
    Does it still have the LPG mixer on top of the carby or has it been removed for good?
    Did you remove the fuel filter or did you replace it with a new one?

    If you can get the slight opening of the secondary throttle valve by wide opening throttle when the engine's running, then it's good.
    You should also see petrol spraying out of secondary venturi.

    However, if you carby secondary throttle valve opens a little bit when the primary throttle is wide open(when the engine's NOT running), then
    something's not right with your carby, it's been mechanically modified or it's not the original Nikki carby, but something else.


    In mine it doesn't and the way the primary and secondary throttle linkages are attached, it's impossible to mechanically open the secondary
    throttle by wide opening the primary throttle. They are not mechanically connected via throttle linkage, but rather connected via vacuum lines.
    I guess the way it works is that the vacuum diaphragm moves from extra vacuum when the throttle is wide open & the connected arm pushed on the linkage connected to the secondary throttle valve.

    Move the throttle shaft side wise and see if there's any play. If there's any play, it's possible throttle valves(both primary and secondary) get stuck. If you can manipulate the throttle shaft that way and move the throttle valves and get them to stick to the walls, then throttle body is not good, 'cos it's too worn out, which means replacing the throttle body with a used one. In that case, it's better to replace the whole carby with a used one or a brand new one.
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
    Cheetah Outreach

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    Legendary dom14's Avatar
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    Quote Originally Posted by CarbyLife View Post
    There is one maybe that could be my problem as the second one was blocked
    Does it still have the LPG mixer on top of the carby or has it been removed for good?
    Did you remove the fuel filter or did you replace it with a new one?
    RB30, some 2-3 inch lift auxiliary LPG tanks
    Few more mods on the way
    http://www.worldwildlife.org/species/tiger
    https://www.panthera.org/
    Cheetah Outreach

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