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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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    Quote Originally Posted by smijaz View Post
    i have a query or a rather a theory.. correct me if am wrong'

    if we spray 1/3 carb cleaner into the float vents it will exert upward pressure on the float and may disturb float setting... so one should let the float chamber empty by cutting of fuel from the cng dash switch and then careful spray cleaner in to vents.
    the liquid does not have much SG and will not do anything to the float, at most it will "flood" the carby - But you can always cut the fuel supply and fill up the bowl to get it cookin'
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    the liquid does not have much SG and will not do anything to the float, at most it will "flood" the carby - But you can always cut the fuel supply and fill up the bowl to get it cookin'
    Xulfiqar bro, i have posted some pictures of my carby. Can u help me connecting vaccum pipes?

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    With the help of searching key terms in this thread. I connected vacuums properly and tested diaphragms. Please correct me if wrong.

    Dashpot connected with 7. It has vacuum at idle only. Dashpot pushes throttle shaft by around 1.5 mm at off engine.

    Distributor vacuum advance connected to 8. It has no vacuum at idle and high vacuum at high rpms.

    Hot idle bypass connected to 10. No vacuum at idle but normal vacuum at high rpms.

    Hot idle bypass is leaked. I can suck air in cold engine too. Can I clean its passages with carby cleaner?. It was left open so dust maybe stuck in it.

    Edit: do we need hot idle bypass for CNG?

    Picture copied from this thread for demo.
    Attached Images Attached Images  

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    Quote Originally Posted by axe.effect View Post
    With the help of searching key terms in this thread. I connected vacuums properly and tested diaphragms. Please correct me if wrong.

    Dashpot connected with 7. It has vacuum at idle only. Dashpot pushes throttle shaft by around 1.5 mm at off engine.

    Vacuum advance connected to 8. It has no vacuum at idle and high vacuum at high rpms.

    Hot idle bypass connected to 10. No vacuum at idle but normal vacuum at high rpms.

    Hot idle bypass is leaked. I can suck air in cold engine too. Can I clean its passages with carby cleaner?. It was left open so dust maybe stuck in it.

    Picture copied from this thread for demo.
    There are 4 hat type diaphrames on carby. All of them are called dashpots? or any specific of em?
    Can you show me full pictures? which dashpot is connevted to wot?

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    @shaidbokhari

    You need to use ''SEARCH'' function of this thread. Search dashpot, vacuum etc like I did and you will get your desired information.

    Read old posts of hitman for pictures.

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    dashpot = slow release system, it also has a little valve in the vacuum line, all the other bits are called vacuum pods and are described by their functions.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    My car isnt stabilizing on slow when running. When standing stayionary, it stabalize. But on drive, whenever i got slow, it turns off. RPM seeems good when standing still. No sign of stalling. Any specific reason?

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    probably the dashpot is not connected properly.

    you should see a lever on the carb move when the cable is pulled and then slowly come back when the cable is released
    haters gonna hate, potatoes gonna potate

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    The one with a needle type thng inside it?

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    Quote Originally Posted by axe.effect View Post
    I cleaned PCV valve with carburetor cleaner. Suction test revealed that it is one side valve. In Normal suction, air flows with restriction. But It closes with a little high pressure suction. Is it ok?
    It also rattles. But after installation, pcv valve has vacuum both at low and high rpms. Cng performance got sluggish. Is this pcv valve faulty?.
    Blowby is normal at idle and very less at high rpms.

    @Xulfiqar @smijaz

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    Quote Originally Posted by axe.effect View Post
    It also rattles. But after installation, pcv valve has vacuum both at low and high rpms. Cng performance got sluggish. Is this pcv valve faulty?.
    Blowby is normal at idle and very less at high rpms.

    @Xulfiqar @smijaz
    Your PCV is Ok. Adjust CNG setting.

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    Quote Originally Posted by smijaz View Post
    its just fuel residue seeping out from the plunger boot.. its mostly seen in fuel from caltex
    I buy fuel from Total only. Btw this reminds me.....where is the fuel filter located? I think i should replace it so where can i find an original one? What brand does it sell under?

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    Quote Originally Posted by axe.effect View Post
    @DUDE007

    How much ml is your carby cleaner bottle?

    The 7CT Carby cleaner i have is 550 ml and it does not give clear instructions about quantity.
    The carb cleaner i bought is 450ml. Brand: 4-X carb and choke cleaner.

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    Quote Originally Posted by syncview View Post
    the push won't really be that strong to disturb the setting but hey. . one can never be too safe

    If I were to go that route I would just empty the float chamber and half-fill it with carb cleaner
    To empty the float chamber, will you remove the fuel pipe entering the carb? When i cleaned the carb i switched from float vents to throat to choke plate i.e i didn't clean them one at a time. I followed this sequence repeatedly until the carb cleaner bottle was almost finshed.

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    remove the fuel inlet pipe and plug it

    start the car and run it till it runs out of fuel..

    fill the chamber with carb cleaner
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    @DUDE007

    You may cut off petrol supply by CNG Petrol converting switch.

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    Bought this svs for ac idling. As it was missing in my khyber. Now unable to find its wiring. Any other option or wayout to wire.
    Current it blocks air when connected with power and release air when not connected. Can anybody help?

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    goto your nearest electrician and convince him to find you the two pin connection from his treasury
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    @syncview i think you got it wrong. i mean to say, i dont know now.how to connect it to my ac. With wiring of my car. I think you take it like i am unable to find the grip that will help me to connect wires with switch. Its not like that. Wire are ready to be connected any where in car, but where ;-)

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    Should i connect negative to body nd positive to ac switch positive? so that when ac switch is in, svs will get current. But as told earlier, when it will receive current, it will b closed, blocking vaccum, which wont activate the solenoid. It means, the switch shldnt receive the current when ac is on to remain open to transfer vaccum from red plug to solnoid to activate the dashpot.

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