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Thread: Self Tunning - Khyber G-10 (Plugs, valve clearance, spark gap etc)

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    Default Self Tuning - Khyber G-10 (Plugs, valve clearance, spark gap etc)

    Salam

    dear members/experts

    I own a khyber 1996. Recently overhauled its engine completely at home by myself except the mechanist part. It has its first oil change at 1100Km yesterday and i am planning to tune it. I have following query for the learned members/experts

    Q.1. recommended spark plugs for khyber g-10 on CNG
    Q.2. Recommended spark plug gap?
    Q.3. Recommended tappet setting Hot/cold?
    Q.4. Running was on petrol with Caltex Havoline formula and now i have switched to CNG with Shell helix HX7 10-40W (synthetic) , is shell HX7 ok?

    What else should i do or check to get max output and efficiency from my g-10?

    regards


    after-note: In addition to the above queries, this thread also contains info on carburetor, AC, electrical, cooling system, brakes & gear issues related to khyber G-10.

    Special thanks to following experts :
    Xulfiqar, Fas133, Margallar, Ahsanzs, wasay_Ahmad, Xplorer, jz, Daniyal
    for their valuable contributions and last but not least
    I am greatful to Cracked for keeping this thread alive by
    raising all the queries/question.


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    thanks i will be check...can i replace my bulbs with hid bulbs?

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    My Khyber has started reducing oil and exhaust is getting blacker and blacker. So I took it to a mechanic for compression test.
    I was surprised to know that only one of the cylinders (cylinder no. 3) had very low compression + its spark plug was oily too. The other two cylinders had no oil on plugs and their compression was also fine. Mechanic has told to open up the engine completely and then either only rings will be done or the complete overhaul.
    Why only one cylinder has developed a problem? What should be the proper remedy?
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    There may be a gasket leak or faulty valve seals for that cylinder. Dry + Wet compression test can shed more light on the state of the valves/rings fault.

    It would be foolish to enact repairs without a proper diagnosis.
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    If just one cylinder is low compression then repair that cylinder only, most cases are bad valve seats causing this.
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    One thing 1 need to ask, Can i take out the stock cassette player out of my khyber myself? Does i needs to remove the whole dashboard for its removal? Can u please guide me if its possible to take out myself? Thanks in advance
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    ^
    no,whole dash board doesn't need to be removed for removal of cassette player.
    go to any audio shop,they will do it free charge,they SHOULD do it free cuz its next to nothing kinda work for them
    REAL men drive manual cars!

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    Quote Originally Posted by cracked View Post
    ^
    no,whole dash board doesn't need to be removed for removal of cassette player.
    go to any audio shop,they will do it free charge,they SHOULD do it free cuz its next to nothing kinda work for them

    Hmmm ok thanks Cracked
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    Assalam-o-Alaikum everyone,
    I needed some help and advice from you guys.
    My cars front suspension needed to be changed as they had become very soft and they were producing noises on bumps.
    Got them changed, replaced them with new KYB units along with new japanese springs of the same size.
    After changing them the car got lifted too much from the front.
    My mechanic said me to try them for a week and then report back.
    After trying them for one week I have noticed that the front shocks are much stiffer than the rear ones. (Im presuming that the rear springs have become too soft with the passage of time)
    Even if there is one person sitting at the back seat and the car passes through a ditch at some speed (like the water drains present in an underpass) it feels as if I have lost control of the car.
    This feeling scares the $}{iT out of me.
    This never happened with its original suspension.
    I told this to my mechanic and he suggested me that we should cut the springs as they are too stiff.
    He was of the view that by cutting them we'll bring the car height to how it was before and the stiffness in the springs will improve the stability at high speeds.
    Should I let him cut the springs?
    If no then what is the best way to resolve this issue?

    P.s: I cannot use the old springs as one of them has developed slight bend due to an accident.

    Im attaching the before and after pictures to give you people an idea.
    Attached Images Attached Images     
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    Dont cut springs, EVER. Creates more problems than you can solve.

    I'll suggest looking first at camber adjustment of front wheels. After that look at rear shock replacement.
    Selling Vitz+local cars - compatible bluetooth Ecu Scantool, High-amp car chargers, Apple-certified Lightning Cables, etc. Click on my name and see my started threads for details.

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    Are you sure that the new Japanese springs are for the same model, They may be for 1300cc versions where the engine weight are higher.
    And I do not believe that the springs gets softer with use, their free length may change which effects the height of the suspension but the spring constant will remain the same. The dampers are the one that gets softer with time but they have nothing to do with the stationary height.

    Do not cut the springs, as the turns of spring at ends are close to each other to give a flat seating. How will that be created in a cut-down end?

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    Quote Originally Posted by ahsanonline View Post
    Dont cut springs, EVER. Creates more problems than you can solve.

    I'll suggest looking first at camber adjustment of front wheels. After that look at rear shock replacement.
    Camber adjustment was done at the same time, and just to make sure that everything is alright I got it checked again from my alignment guy.
    They both said that the camber adjustment is alright, however they said that the shocks are not good as they are quite stiff, plus he said that the car is around 1.5" higher than normal which is not good.
    He said that it may affect the cars stability at higher speeds.
    Okay I wont be cutting springs, so should I now look for new springs?



    Quote Originally Posted by metalhead View Post
    Are you sure that the new Japanese springs are for the same model, They may be for 1300cc versions where the engine weight are higher.
    Hmmm...
    I cant say.
    The length was the same.
    I got them from Kiyani Autos Gawalmandi and he said that these are the original Japanese ones that came with 1.0L Khyber.

    And I do not believe that the springs gets softer with use, their free length may change which effects the height of the suspension but the spring constant will remain the same. The dampers are the one that gets softer with time but they have nothing to do with the stationary height.
    Agreed on the damper part, cant say much about the springs though.
    BTW if there is any way to repair the bend in springs then I'll be happy to use its original springs with new dampers.

    Do not cut the springs, as the turns of spring at ends are close to each other to give a flat seating. How will that be created in a cut-down end?
    Exactly!
    Thats what I was concerned about.
    One of the most difficult things in the world is to know how to do something, and to watch without comment, somebody else do it incorrectly.

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    I would recommend you to use the original springs... regarding the bend; what's it like? i mean is it a bend throughout the spring ( or a curled axis) or its a bend at a point in the spring? A snap will be better to understand and expert's opinion is required after seeing the pic.

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    ^ The bend is slight, it can be noticed if I roll the spring on a flat surface with a very gentle push.
    At that time one can easily judge the bend.
    Im attaching a picture.
    I've tried to explain the bend with the red lines.
    The way the lines are bent, is the way the springs are bent.
    Attached Images Attached Images  
    One of the most difficult things in the world is to know how to do something, and to watch without comment, somebody else do it incorrectly.

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    Experts or experienced may comment on it, whether it can be straightened out or not?

    In my opinion it can be done but with care not to bend backwards too much. It may break. Breaking is catastrophic, OK; but leaving hidden cracks in the spring will trouble you in the middle of the road.

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    Bump!!
    One of the most difficult things in the world is to know how to do something, and to watch without comment, somebody else do it incorrectly.

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    Hello?
    One of the most difficult things in the world is to know how to do something, and to watch without comment, somebody else do it incorrectly.

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    the springs are not bent, they are made this way. many cars have such springs, wider in the middle and thinner at the ends. and if you cut your springs you have to be very very careful as to not overheat the spring wire, it will lose the elasticity - if you cut correctly your wprins will end up harder than original.

    But why cut them? - new springs will settle down in a month or so by themselves.
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    Quote Originally Posted by Xulfiqar View Post
    the springs are not bent, they are made this way. many cars have such springs, wider in the middle and thinner at the ends. and if you cut your springs you have to be very very careful as to not overheat the spring wire, it will lose the elasticity - if you cut correctly your wprins will end up harder than original.

    But why cut them? - new springs will settle down in a month or so by themselves.
    Thanks for the reply guru!
    So what do you propose?
    Should I wait for a month and then report back?
    Its been 2 weeks since I got them changed.
    The thing bothering me is the abnormal gap between the front tyre and the fender.
    Even if there is one person sitting at the back seat, the car gets lifted to such an extent that my low beams at that time are high enough to light up a 6' guy's face coming from the other side.
    Moreover with just one person at back, if I cross a water drain, present at any underpass at around 80km/h I get the feeling as if the front wheels have lost ground for a split second.

    Correct me if Im wrong.
    This is what Im expecting:
    "If I change the springs with its old ones"
    Since the dampers were totally worn out so the car was lowered from front with suspension getting too soft.
    Now if I retain the old springs with new dampers, the ride height will become lower, like it was before but the suspension will not be that soft like they were with worn out dampers.
    On hard braking it will not sink into the road from the front, like it did with worn out dampers?
    One of the most difficult things in the world is to know how to do something, and to watch without comment, somebody else do it incorrectly.

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    your description sounds like the springs changed the jounce, rebound drastically - which should not be the case, new dampers and springs should restore ride to original. Please verify that these springs are actually for your car.

    best would be to reinstall the old ones and test.

    If you are losing traction from the rear wheels, check the rear strut, springs and all bushings for wear. Even with a raised front you should not skid out if your dampers are good.
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    Quote Originally Posted by Xulfiqar View Post
    your description sounds like the springs changed the jounce, rebound drastically - which should not be the case, new dampers and springs should restore ride to original. Please verify that these springs are actually for your car.

    best would be to reinstall the old ones and test.

    If you are losing traction from the rear wheels, check the rear strut, springs and all bushings for wear. Even with a raised front you should not skid out if your dampers are good.
    Hmmm...
    Thats what I was expecting when I changed them.
    Anyways about the rear bushes and springs, I got them checked and there is no issue with the rear.
    All bolts tightened and everything is in spec.

    Do note that Im using 1~1.5" spacers at the rear and even with them the front got raised.

    I was unable to get a picture of the springs when I got them but they were completely straight, unlike the ones that we removed (The were fatter from the middle)
    Will get its original springs fitted back in 4~5 days (after Eid) Insha-Allah and will report back.
    Thanks a bunch for the information.

    Eid Mubarak!
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