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Thread: Suzuki Mehran giving jerks after carburettor service

  1. #1
    MGK
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    Default Suzuki Mehran giving jerks after carburettor service

    Everything was working perfect with my car when the carburettor seal/jan started to leak petrol. It was a 10 to 15 minutes job to just open the carburettor put the new seal and fix it back but the mechanic suggested to service/clean complete carburettor for any dirt deposits and the car would have smooth drive but after all this work done now the car is giving jerks specially when engine is cold the jerks are massive mileage has gone poor if I press full accelerator the car doesn't responds in fact it hinders to take power/speed. Previously it was starting on half self even in the morning but now it takes about 2 or sometimes more attempts to start up. Please help me solve this issue.

    In short it feels like till half of the accelerator is pressed the fuel supply is normal but when the remaining half is pressed i.e. full the fuel supply is not adequate and the engine starts missing

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    get him to retune it, most probably the off idle circuit is flooding. What tools were used to clean it, if he used any sort of steel wire to clean any brass part - its dead.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    @ Xulfiqar
    Absolutely..
    You may use some Hi-Octane for short time for carburator health
    <<<***ALHAMDULILLAH***>>>Yah ALLAH tera Shukar

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    MGK
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    Quote Originally Posted by Xulfiqar View Post
    get him to retune it, most probably the off idle circuit is flooding. What tools were used to clean it, if he used any sort of steel wire to clean any brass part - its dead.
    He has tuned it twice now after this problem, the missing goes away for some time, sometimes it gets completely ok but just in the next few minutes with the shift down of gear it gets worse. No hard tool was used a simple brush and petrol out of my car's fuel tank was used to clean the carb parts.

    Quote Originally Posted by Zeeshan206 View Post
    @ Xulfiqar
    Absolutely..
    You may use some Hi-Octane for short time for carburator health
    Never used it in my life time and its just a mehran i have heard people use hi octane in efi engines to prevent missing and knocking but never in mehran dont u think that these obsolete engines are not made for it? i dont to experiment more since just a small mistake has got me here

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    I often use HI-Octane in my khyber for cleaning and best performance.. Once in a month 2 or 3 Liters
    <<<***ALHAMDULILLAH***>>>Yah ALLAH tera Shukar

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    you sure the ignition system is good, no pitting in the CB points etc?
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    so he used petrol and tooth brush how good
    brother u must have insisted to use carb cleaner instead
    there might be some issue in the carb chamber i dont know whats it called in other PK
    go to him make him pay by re doing all carb again but this time with carb cleaner also what xulfiqar sir indicated
    Hanjiii Kaa Storeey Eehh !

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    I always use air pressure for carburetor cleaning.
    Never loose hope in life,every step gives u something.

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    insert the carb cleaner spray's straw into the vacuum line and spray, do this with the jets when they are installed in the carb, it cleans nice and you get to see how the venturis spray
    haters gonna hate, potatoes gonna potate

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    Quote Originally Posted by argtr65 View Post
    I always use air pressure for carburetor cleaning.

    you ever try to clean varnish with air pressure?
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    you ever try to clean varnish with air pressure?
    please explain to me the purpose of the jets, previously i thought those were the things that did the spraying but now i discover that is the job of the venturis,

    are the supposed to restrict the flow of fuel?
    haters gonna hate, potatoes gonna potate

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    Quote Originally Posted by margallar View Post
    please explain to me the purpose of the jets, previously i thought those were the things that did the spraying but now i discover that is the job of the venturis,

    are the supposed to restrict the flow of fuel?

    They are actually restrictions, infact they are precision milled instruments that allow a quantified flow rate through them. To understand this - go to the library and study flow/volume/pressure etc.

    When you understand those - then think backwards because carbies work on negative pressure. (getting a headache yet?)
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    yup i just wanted a confirmation, i studied bernoulli's effect bla bla bla just a few days ago
    haters gonna hate, potatoes gonna potate

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    Quote Originally Posted by Xulfiqar View Post
    you ever try to clean varnish with air pressure?
    It is under stood,to remove gunk if any,after having dismantled dip it into kerosine oil for some times then apply pressurized air to clean out ports.
    Never loose hope in life,every step gives u something.

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    Quote Originally Posted by argtr65 View Post
    It is under stood,to remove gunk if any,after having dismantled dip it into kerosine oil for some times then apply pressurized air to clean out ports.
    kerosene wont move the varnish - you need something with acetone and toulene in it.
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    Quote Originally Posted by Xulfiqar View Post
    kerosene wont move the varnish - you need something with acetone and toulene in it.
    a few days i was thinking of motorcycle carburetors, one for each cylinder, i won't be doing it anytime soon, but i really wonder what the engine will feel like if i do, and what kind of carburtors will work, i guess the ones on local bikes are too small. i saw a guy make a new manifold with yamaha r1 carburetors for his swift gti (dohc), but he never posted any videos of it on the car
    haters gonna hate, potatoes gonna potate

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    I have seen such setup on a D15 honda - that thing could scream like a banshee but you lose some low torque because you have no manifold run, the airbox is equally important to prevent eddying of the air as the individual cylinders pulse their carbs.

    You get tons of top end power though - but you would also need a hotter cam to make sure the engine can actually breathe at that rpm
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    top end torque is okay, but since carburetors don't have any rev limit how much rpm is the maximum for the engine, i wouldn't want to end up blowing it

    the paint is already half gone, might as well buy a rusty bonnet and some broken lights. that would be the perfect appearance with the motorcycle carbs .....that would look like a car out of an american horror movie

    i think if someone gets to tune a setup like that to perfection then the car will idle better than stock, the right amount of fuel will get to each cylinder. but tuning it would be a challenge
    haters gonna hate, potatoes gonna potate

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