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Thread: Trying to solve gs150's backfire issue while slowing down.

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    Default Trying to solve gs150's backfire issue while slowing down.

    On the net they say it might se caused by a lean condition. So what about this is it lean or what?
    Need help regarding this backfire issue.Trying to solve gs150s backfire issue while slowing down -1059328Trying to solve gs150s backfire issue while slowing down -1059329

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    Quote Originally Posted by N0m1 View Post
    ^^^Lucky man.55kmpl at 70-80kmh.(Y)

    Last week, my friend borrowed my bike to go from ISL to peshawar, he went single and came back with a pillion, and after coming back, he calculated fuel consumption which came out 50.5Km/L, and when i asked him at what speed he went?? He looked at me with a big Grin and said "yaar mein to 90~100 pe hi gaya aur aaya hoon".

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    its nt ruing its a feature ..

    and very much ignored by our local mechanics..

    that has another purpose of the last resort mixture setting in case u are going on high altitude .. where u need to reduce the amount of petrol being mixed with air..

    normally at high altitude u would need to use smaller dia main jet .. but if u dont have then the needle may be used to compensate ..

    anyhow marzi ha ..


    Quote Originally Posted by gull_s_777 View Post
    i usually ride at 70~80Km/h , at that speed there is no popping + it gives 50~55Km/L mileage, i don't wanna ruin it


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    I'm starting to think that the spark plug is the problem. I think a hot spark plug would do the job. I'm currently using a ngk cr8e maybe cr7e or cr6e will probably stop the backfire.
    What do you guys say?

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    Quote Originally Posted by asjdsm View Post
    normally at high altitude u would need to use smaller dia main jet .. but if u dont have then the needle may be used to compensate ..
    Jet needle adjustment is effective only upto 3/4 throttle, 3/4 to full open throttle is main jet territory. am i right????

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    ?ess right .. but most of the torqe is at middel or a little above rpm .. and in that case in areas like ascent to murree u wont get an opportunity to use full throttle mostly u will be doing middle range rpm .. so it may compansate a bit ...

    EDIT
    also the main jet opening is controlled through the needle.. moreover the function of the needle doesnt ends at 3/4th .. but that is surpassed by the main jet itself .. and the needle still is in work even at full throttle .. but the major metering is done thorugh main jet there .. so that is the most Dominent one..

    also its a last resort .. the real thing is main jet for such use .. together with needle adjustment..

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    Quote Originally Posted by Haji__John View Post
    I'm starting to think that the spark plug is the problem. I think a hot spark plug would do the job. I'm currently using a ngk cr8e maybe cr7e or cr6e will probably stop the backfire.
    What do you guys say?
    any results?

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