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Thread: Suzuki GS150 misfiring issue

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    Default [RESOLVED] Suzuki GS150 misfiring issue

    I have been having a problem with my GS150 since the past few weeks. It does alot of missing in the cold state and the idle RPM are never stable. It tends to turn off if i try to accelerate modestly in the cold state. The overall performance gets better when it is rode around 4-5 km's and the engine is up to a high temperature though. But those first few Km's are nearly impossible to bear.
    After alot of reading at PW forums, i have tried the following solutions:

    * Got it tuned from Suzuki Asif autos (A grade shop) at McLeod road Lahore
    * changed the oil (SGO) and air filter
    * changed the spark plug to NGK platinum (G power)
    * change the ignition coil to Nippon denso bottle ignition coil
    (Toyota Mark-||'s)
    * tried to set the air fuel mixture myself a few times
    * measured the battery voltage before and after starting the bike (they were adequate)

    but still no use! none of these seem to solve the problem. Does anyone have any idea what might be wrong here?

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    @sleepyhead Indeed, Its a must try. Infact the only things i learned from this misadventure is that Kashif autos probably has the best mechanics in Lahore to rectify GS150 issues and that LiquiMoly Racing4T 10W40 is the best oil for the bike, period.
    Classic rock lunatic, F1 buff, Aircraft connoisseur, Motorbike maniac, exquisite watch zealot, tennis player and an Unconditional patriot.

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    Quote Originally Posted by fanno__ View Post
    @sleepyhead Indeed, Its a must try. Infact the only things i learned from this misadventure is that Kashif autos probably has the best mechanics in Lahore to rectify GS150 issues and that LiquiMoly Racing4T 10W40 is the best oil for the bike, period.
    Quite right! I am already using LiquiMoly Gonna try tomorrow in Faisalabad and shall see. I'll post back after little bit of testing

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    Good keep going always with LiquiMoly

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    @fanno__ So I went to the guy known as Suzuki expert. He checked and assured me that valve clearance is fine. I was thrown away by the fact he didn't have any gauges. But on my way back I bought a feeler gauge and a number 10 socket wrench, myself. This is so I can tweak this sucker myself!

    For any one curious here are the tappet clearance settings for GS150.

    Cold State:
    <strike>
    Intake: 0.03mm to 0.07mm
    Exhaust: 0.13mm to 0.18mm
    </strike>

    CORRECTION:
    The company provided settings are full of SH*T. DO NOT USE these. It will create loud ticking sound and will of course start damaging the engine.
    Use this instead:

    Intake & Exhaust : 0.08 mm

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    As promised, here's the update. One day later, the damned problem has been fixed. Now the bike starts without any hiccups even at near zero temperatures (last night it was 7 C), without using choke.

    For anyone in FSD, the guy's name is Khalid. He's Suzuki's authorized mechanic and his shop is just opposite to the Suzuki showroom on Narwala Rd.

    I guess, he has a magic touch, even though he didn't have any feeler gauges for the valve clearance
    One other thing he did was to drain to the fuel from carburetor using overflow drain screw

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    Jadu ki jappi !?
    So it really exists.
    "Imagination is more important than knowledge"

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    Quote Originally Posted by Haji__John View Post
    Jadu ki jappi !?
    So it really exists.
    One would imagine it doesn't. But it really does cause imagination is important than knowledge

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    Quote Originally Posted by sleepyhead View Post
    @fanno__ So I went to the guy known as Suzuki expert. He checked and assured me that valve clearance is fine. I was thrown away by the fact he didn't have any gauges. But on my way back I bought a feeler gauge and a number 10 socket wrench, myself. This is so I can tweak this sucker myself!

    For any one curious here are the tappet clearance settings for GS150.

    Cold State:
    Intake: 0.03mm to 0.07mm
    Exhaust: 0.13mm to 0.18mm
    My dear where did you get this 0.03mm feeler gauge from.i have need this one gauge for me can you send a one piece to me?

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    Quote Originally Posted by hamikhan View Post
    My dear where did you get this 0.03mm feeler gauge from.i have need this one gauge for me can you send a one piece to me?
    You have to get the whole set of 32 feelers. I bought it from Perfect Hardware at Circular Rd for Rs. 650.

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    Quote Originally Posted by sleepyhead View Post
    You have to get the whole set of 32 feelers. I bought it from Perfect Hardware at Circular Rd for Rs. 650.
    From which measurement it starts & what is the end of this feeler gauge can you give me its full details my dear?

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    Quote Originally Posted by hamikhan View Post
    From which measurement it starts & what is the end of this feeler gauge can you give me its full details my dear?
    Starts at 0.03mm and goes all the way to nearly 1.0 mm.

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    Quote Originally Posted by sleepyhead View Post
    Starts at 0.03mm and goes all the way to nearly 1.0 mm.
    Is its measurement goes gradually or measurement Sudden jumps example in common feeler gauge measurement starts from 0.05mm & after that jump to 0.08mm

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    Quote Originally Posted by hamikhan View Post
    Is its measurement goes gradually or measurement Sudden jumps example in common feeler gauge measurement starts from 0.05mm & after that jump to 0.08mm
    Sorry for the delayed response. But it is the same as this one over here:
    Feeler Gauge - 32 Piece, SAE/Metric

    (See the sizes section in description)

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    Thanks dear

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    Default GS 150 Manual has wrong valve/tappet clearance dimensions

    Quote Originally Posted by hamikhan View Post
    Thanks dear
    Here's one more interesting find for dear friends @hami, @basic and to other folks who will/are reading the official service manual:
    DO NOT USE COMPANY PROVIDED VALVE CLEARANCE SETTINGS.

    I believe they are either mistyped or are for some other model.

    Here's the explanation.

    Suzuki GS150 misfiring issue -1540545

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    Uh huh kon kehta ha?
    "Imagination is more important than knowledge"

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    Quote Originally Posted by Haji__John View Post
    Uh huh kon kehta ha?
    You will, if you would try to use those printed values.
    Basically anyone will.

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    Dear fellow if you are in Faisalabad, can we meet?

    Quote Originally Posted by sleepyhead View Post
    You will, if you would try to use those printed values.
    Basically anyone will.
    MADE IN WAZIRABAD.............................RUNNING IN FAISALABAD..........

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    Sir @basic aap ne manual printed values hi use ki thi bike soundless ha na?
    "Imagination is more important than knowledge"

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    Quote Originally Posted by basic View Post
    Dear fellow if you are in Faisalabad, can we meet?
    Sure basic bhai. Whenever you plan to visit Canal Road (either east or west side) or Gutwala, let me know please

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