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Thread: help regarding cb23 carboretor

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    Exclamation help regarding cb23 carboretor

    salam all fellows
    i have a charade with cb23 on cng&petrol now problem is the rmp unstability
    mean in cold start mean in morning on cng the car vibrates alot and rpm is very low at 300 or 400
    but when engine reaches to its normal temp (needle at half or quater) the rpm reaches to 1000 on cng
    but when i convert it to petrol and rmp increases and goes to 1500 and some time 1800.now
    i dont know that it has auto choke or its without auto choke or what ever .
    some vacuum pipes are also missing
    waiting for xulfiqar bhai and other experts

    Similar Threads:

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    Quote Originally Posted by Proverbial_Slang View Post
    Bro check previous posts in this thread; I have already posted the pictures.
    bro what is the idle RPM of your charade ?
    on petrol and CNG...

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    Quote Originally Posted by usman505 View Post
    so xulfiqar bro today start the car after 3 days choke cable is not present so there was serious vibration on cold start so i have to slightly
    press the gas to keep engine running .
    DASHPOT:
    so dashpot starts working when i press the the accelerator the dashpot rod(or piston) quickly comes out and and when i release the gas
    it takes 4,5 seconds to came back to idle .i adjust the setting in such a way that when i press the accelerator up to 2500 RPM and then release it ,it come back to 1500 RPM normally and from 1500 RPM to 1000 or 900 RPM it takes 4 or may be 5 seconds .Is that ok ?because m not expert so...
    POWER VALVE OR PISTON:
    is also connected via 4 way from distributor and carb base (where plastic filter is connected in above pics) but 1 connection on top of
    4 way is remain unconnected (it is sucking air man and when i put my finger on it i felt my finger sucking inside and at the same time the rpm also decreases) according to u it goes to the vent valve and then from there to air filter but there is to vent valve clipped
    with my air filter.so i connect it to air filter directly is that OK?
    THANK YOU VERY MUCH ZULFIQAR BRO i m very thankfull to u for ur kind help.
    and please correct me if i do some wrong connections .
    and last thing bro please tell me about the golden type pipes on carby base as i said before these two pipes push me to the limits
    just want to bang my head on them

    if you dont have a vent valve clipped on the airbox - then connect that vacuum pipe to the thermostrip valve under the airbox - do not leave it open. The 4 second dashpot delay is correct for a hot engine, not a cold one. Hot means that your engine should have a thermostat valve installed in it. With a correct working dashpot you will experience that the engine would not want to drop rpm when you change gears

    Connect the two water pipes to the pipes that are blocked on your engine.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    if you dont have a vent valve clipped on the airbox - then connect that vacuum pipe to the thermostrip valve under the airbox - do not leave it open. The 4 second dashpot delay is correct for a hot engine, not a cold one. Hot means that your engine should have a thermostat valve installed in it. With a correct working dashpot you will experience that the engine would not want to drop rpm when you change gears

    Connect the two water pipes to the pipes that are blocked on your engine.
    yes m talking about hot engine thermostate valve in on its place with auto radiator fan.
    ok about block pipes here m again telling one is on the exactly back of intake manifold and on is on the back of engine
    head just above the alternator r u talking about those ?

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    bro one more thing which i observed today is the decrease in RPM when the headlights or radiator fan turns on .now how can we solve this prob.BTW-the car is without AC

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    firstly cap or use the spare vacuum line from the 4 way, connect the water pipes from the manifold and head. make sure you have the alternator ground strap connected.

    You cannot completely remove the rpm drop though - make sure your engine is idling at 950 rpm
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    yes RPM is 950 on cng and on patrol its 1000 or 1100.
    bro now only oil cover pipe is left unconnected where to connect it ?

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    the above said RPM is without any electric load and on hot engine.
    950 RPM on cng is with a little bit vibration

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    the oil cap vacuum pipe goes to the manifold port on the side where the accelerator cable is. There is only one port. Be sure to use very very good quality pipe on it, Those fumes are very very hot and toxic. They will eat out a cheap pipe in 2 days of running. Also make sure the oil cap is tight when you place it on the cover, Its got a thick O ring in it.
    Also make sure the big breather pipe from the tappet cover to the airfilter is in place. The narrow one from the oil cap and the thick one both work as a team.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    yes there is place for pipe below the accelerator cable on base of carby .r u talking about that ?

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    yes - it would have suction too.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    help regarding cb23 carboretor -1084714
    this one ?

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    yes.. thats the one. If you test it - it would be sucking air.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    no havent test yet .but the hose to which break srvo is connected has some serious sucktion
    if i remove the pipe in below pic the cars engine stops immideatly
    this on :help regarding cb23 carboretor -1084735
    the small one ihas serious sucktion

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    zulfiqar bro????

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    the brake servo hose is quite large and will have strong vacuum suction, the engine will die from this giant air leak. Do not remove it.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    but manual says that the small pipe on the side of servo hose marked in above photo should connect to air cleaner box and BVSV via 3 way F shape CONNECTOR ..
    i was thinking that 'is tarhan engine shut nai ho jaey ga' ?

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    Quote Originally Posted by usman505 View Post
    but manual says that the small pipe on the side of servo hose marked in above photo should connect to air cleaner box and BVSV via 3 way F shape CONNECTOR ..
    i was thinking that 'is tarhan engine shut nai ho jaey ga' ?
    The BVSV is the metal strip thing with two vacuum pipes in the air cleaner, its a closed system. Vacuum is routed to the thermostrip which is held there until it opens up which then routes vacuum to the vacuum pod controlling the flap at the edge of the aircleaner. The F connector can also be used to supply vacuum to the A/C/power steering idle up if you want. Consider it a main vacuum port. It will only shut off the engine if the vacuum leak is too large.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    help regarding cb23 carboretor -1085325
    is this BVSV?

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    The usual BVSV is inside the air cleaner box -

    B = Bimetal
    V = Vacuum
    S = Switching
    V = Valve

    This valve you pointed to was found on some japanese import "recondition" models and was also termed as BVSV. It allows the choke breaker to operate. It works when the manifold gets hot. The vacuum port for this should be near the carburettor throttle butterfly body.

    How many clips are on your air cleaner?

    Memory is hazy now for these cars, its been a long time.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    The usual BVSV is inside the air cleaner box -

    B = Bimetal
    V = Vacuum
    S = Switching
    V = Valve

    This valve you pointed to was found on some japanese import "recondition" models and was also termed as BVSV. It allows the choke breaker to operate. It works when the manifold gets hot. The vacuum port for this should be near the carburettor throttle butterfly body.

    How many clips are on your air cleaner?

    Memory is hazy now for these cars, its been a long time.
    by clips u mean ports to connects pipes
    there r 4 places to connect pipe on air cleaner
    2 on below (temperature sensing valve)
    1 on back side of cleaner
    and 1 on above the accelerator cable

    u can see the pic on previous page

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