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Thread: Ravi Piaggio Back Fire Problem

  1. #1
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    Default Ravi Piaggio Back Fire Problem

    Dear All after having four years of good experience with my bike it has suddenly developed a back fire problem whenever throttle is released after high revolution.
    You revolve the throttle upto 5k or 6k RPM and whenever you release you hear small or large back fires.


    Fuel average is good and around 43kmpl and so is the pick and top speed.
    After getting the EURO II checked at Islam autos it appeared to be ok.
    the Mechanic still insisted to get it changed but he didn't guarantee that it will rectify the problem.

    i have personally examined my EURO II and diaphragm is intact.
    Also the pipes of EURO-II are in good condition with no leaks.


    So i need experts opinion on what could be its cause either lean mixture or EURO II or another thing.
    Thanks



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    dear , adjust the plug gap to service limit or change the plug it will solve the issue INSHALLAH , when a bike misfires like this whether euro 2 or not , the plug has completed its life mostly
    legend will revive soon

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    I have already replaced the plug with a new one, i also suspected the plug issue, but problem is still there

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    Tension not my friend it happens regularly in carby bikes

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    Default

    there can be many reasons..

    1 - A fine tuning of Carb is may be required
    2 - Plug Gap If not proper then it may happen
    3 - Snorking (faulty) emmision controller (called euroII locally) will make it also..
    4 - badly tuned valve setting may also cause this to happen.


    when I purchased my RP it has the same issue as I bought it used .. it used to give a Boom sound on releasing the acceleration back and it used to do .. vrooo....DOOM ooommmmm... so I tuned the carb checked the emission controller checked the valve but the back fire sound did not go then I changed the plug and the back fire was gone but I found it really boring not to Boom and give a flame (which is visible in night whn it booms.. so i put back the old plug again ...) ... lol hehehehe h ....
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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    Quote Originally Posted by vickytulla View Post
    there can be many reasons..

    1 - A fine tuning of Carb is may be required
    2 - Plug Gap If not proper then it may happen
    3 - Snorking (faulty) emmision controller (called euroII locally) will make it also..
    4 - badly tuned valve setting may also cause this to happen.


    when I purchased my RP it has the same issue as I bought it used .. it used to give a Boom sound on releasing the acceleration back and it used to do .. vrooo....DOOM ooommmmm... so I tuned the carb checked the emission controller checked the valve but the back fire sound did not go then I changed the plug and the back fire was gone but I found it really boring not to Boom and give a flame (which is visible in night whn it booms.. so i put back the old plug again ...) ... lol hehehehe h ....
    is it the patakha thing called by AHL 125 owners, they turn ignition on and off in high RPMs ?

    or is the a little blast sound produced sometimes when RPM is high and you release accelerator ?

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    no its not exactly like CG patakha ... but becyase I am using a free flow exaust so its like a growl and the DHUMMM!! and then back to normal growll... it throws flame when it does that which can be noticed in night, i understand it to some extent as I run my bike on rich fuel setting ...

    Quote Originally Posted by neodescorpio View Post
    is it the patakha thing called by AHL 125 owners, they turn ignition on and off in high RPMs ?

    or is the a little blast sound produced sometimes when RPM is high and you release accelerator ?
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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    Quote Originally Posted by vickytulla View Post
    .. vrooo....DOOM ooommmmm...
    Now that's a sound i'd like to hear.

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    Quote Originally Posted by vickytulla View Post
    no its not exactly like CG patakha ... but becyase I am using a free flow exaust so its like a growl and the DHUMMM!! and then back to normal growll... it throws flame when it does that which can be noticed in night, i understand it to some extent as I run my bike on rich fuel setting ...
    okay , well can RP do a patakha like CG ? whats the science in this behaviour ?

  10. #10
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    Hajmola Sir

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    on rich feul setting decrease the gap of Plug and do the same Key on off as on CG and RP would do tha patakha but it would not be a a bullet sound it would sound like a Gun ona silencer.. "CHAAK" sound ... CG has a MagnaPhone (sound Amplifying) exhaust
    thats why it doubles the Patkha sound.. where as paiggio has a EuroII complaint exhaust and do not make noise upto certain DB level..

    Ravi Piaggio Back Fire Problem -1421110


    where as in my paiggio I am using a free flow exhaust that is why it has a hard Bass sound on the kaboom.
    Quote Originally Posted by neodescorpio View Post
    okay , well can RP do a patakha like CG ? whats the science in this behaviour ?
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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    Okay , does this free flow exhaust affects bike engine, acceleration, top speed or consumption or anything else ? What that on your bike ?
    Ravi Piaggio Back Fire Problem -1421575

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    Yes!
    If I grotesquely oversimplify, on a street bike like paiggio which comes with a silent and a restricted muffler and plenty of "Jaliyan", bends and lengthy pipe, it pretty much comes down to providing the most silent gas flow possible to make it proper city commuter.

    Furthermore, the its stock muffler is a EuroII complaint muffler which has a meaningful restriction to gas flow and harnessed with a emission controller,

    So by changing to a low-restriction/free flow muffler and tailpipe on such bike gives a precious gain in low end torque. so simply any reduction in exhaust restriction is usually beneficial if and only if bike is also feeded with a free flow intake so I have removed one layer of foam stock air filter as well....


    That my friend is a brake Oil bottle for rear brake!


    Quote Originally Posted by neodescorpio View Post
    Okay , does this free flow exhaust affects bike engine, acceleration, top speed or consumption or anything else ? What that on your bike ?
    Ravi Piaggio Back Fire Problem -1421575
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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    Quote Originally Posted by vickytulla View Post
    So simply any reduction in exhaust restriction is usually beneficial if and only if bike is also feeded with a free flow intake so I have removed one layer of foam stock air filter as well....
    So if you do so there is no harm in having a free flow exhaust ? ? ?

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    I am not technically sound enough to through light on this but my instincts say that an engine gives a more power on doing this change means engine is more stressed ? so that means it will be tired soon ? Just a guess some pro might have some better explanation ?

    Quote Originally Posted by neodescorpio View Post
    So if you do so there is no harm in having a free flow exhaust ? ? ?
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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    Quote Originally Posted by vickytulla View Post
    I am not technically sound enough to through light on this but my instincts say that an engine gives a more power on doing this change means engine is more stressed ? so that means it will be tired soon ? Just a guess some pro might have some better explanation ?
    Any other experianced guys ? ? ?

  17. #17
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    @xulfikar @imranbhatti sir can you guys can enlighten us in this ....

    Quote Originally Posted by neodescorpio View Post
    Any other experianced guys ? ? ?
    https://www.pakwheels.com/forums/motorcycle-travel-diaries/277725-sober-riders-visit-khunjerab-adventurous-way-via-nori-pass

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