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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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    I am having same issue from almost 2 years, couldn't find any solution yet.

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    My Junoon is normal on daily use.
    But if i touch 110Km/h and after that when slowing down, it gives 2 or 3 backfires, seems kind of fun to me

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    ^^^Impressive speed yar.110kmh is high.
    I Am the Feel
    I Am The Yamaha!

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    I've adjusted the carb as perfectly as I could. There is a slight reduction in the noise of the backfire but they are still there. So I READ THE NEXT PROBLEM COULD BE THAT THE EXHAUST TAPPET IS TOO TIGHT. Gonna try that and report results.

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    The plug shows that you are very likely getting lots of rust in the fuel, either from the bike's fuel tank, or the fuel pump. Clean out the tank and/or change fuel pumps.

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    Yes I changed to a good caltex pump a week ago.
    Anyway I cleaned the plug before putting it back

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    same problem on my 125.......when going around 0 90 coyinuuous nd when i leave race it backfires.....the sound is low when i leave race in lesser time to reduce speed but when i keep that speed continuous longer....the backfire sound is like a bang.......the volume of soound depends on how longer its kept on that speed
    M @ c!v!c '95 L0v3&

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    there could be many reasons..

    1: the timing is not ok
    2: exhaust valve is not properly adjusted (clearance) .. play with it .. try setting it a little bit loose then what is recomended then check .. then try a bit tight . (very little tight compared to recomended .. not too tight)
    3: carb issue... first explain how the backfire happens.. is it happening when u accelerate or decelerate (and how is acc/decleration .. sudden or slow and smooth .. mean race slow slow barhathay ho ya achanak kam ziada kartha ho.. ) AND race taqreeban kitni % di hothi ha ? total race ka ?

    4: some electrical problem.. though chances are low..

    5: this should be point 3 .. there may be some leak b/w the exhaust and cylincer... try to tigh the bolts of silencer....

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    Do check:
    Ur choke cable - sometimes it is stuck and thats why little bit choke is pulled even at default position. which results in these backfires... my ride used to this a lot too... but the problem was solved after the choke cable was replaced.

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    It happens when I decelerate from a minimum of I think 6000 rpm when I get go of the accelerator. I think it doesn't happen when I decelerate slowly.
    Quote Originally Posted by asjdsm View Post
    there could be many reasons..

    1: the timing is not ok
    2: exhaust valve is not properly adjusted (clearance) .. play with it .. try setting it a little bit loose then what is recomended then check .. then try a bit tight . (very little tight compared to recomended .. not too tight)
    3: carb issue... first explain how the backfire happens.. is it happening when u accelerate or decelerate (and how is acc/decleration .. sudden or slow and smooth .. mean race slow slow barhathay ho ya achanak kam ziada kartha ho.. ) AND race taqreeban kitni % di hothi ha ? total race ka ?

    4: some electrical problem.. though chances are low..

    5: this should be point 3 .. there may be some leak b/w the exhaust and cylincer... try to tigh the bolts of silencer....

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    ^ Yes happens.
    If its the choke prblem, the patakha would be relatively louder and u might also spot carbon at ur exhaust tip when inspected...

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    No the problem isn't the choke I checked it today.
    Quote Originally Posted by Automotorsport_Lover View Post
    ^ Yes happens.
    If its the choke prblem, the patakha would be relatively louder and u might also spot carbon at ur exhaust tip when inspected...

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    i had the same problem in my ravi piaggio ... after doing some research i closed the pipe which comes from EURO 2 system ... which is situated in my right tappa ...now the backfire are gone and bike has more pick ..
    many of the mechanics said blah blah .....and said that it was coils. plugs or carburetor problem .. its funny lol ...but it worked :p

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    Quote Originally Posted by Haji__John View Post
    It happens when I decelerate from a minimum of I think 6000 rpm when I get go of the accelerator. I think it doesn't happen when I decelerate slowly.
    most bike now a days are made to run very lean.. that is to use less petrol then needed.. this while in normal smooth operation is less damaging then a proper mixture settings .. but is certianly not good at abrupt changes to speed..

    there are three circuits in normal carburetors.. one is used to contorl the mixture when ur race is 1/3rd second controls mixture from that to a little over half .. the third is to cntrole mixture for 3/4 to full wide open throttle..

    normally it does happens when ur carb is changing form full ckt to middle ckt .. there is a small interval of time whre mixture is very lean.. hence patakha.,,

    solution is to enrich the two ckts .. main and middle ...

    the best try for u is to try if raising the needle in ur carb makes any differnce ?

    also make sure u clean ur carb with compressed air... not only ur jets.. i maintin my bike myself but sometime only cleaning carb with comrpessed air solves such issues...

    also tighten the exhaust nuts .

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    ok , here is my junoon's spark plug
    backfire issue only if i cross 100Km/h...
    i guess i am running too lean for that speed?????
    Attached Images Attached Images  

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    its tottally poppat .. awewsome.. no need to wory..
    however if u want to remove that popping .. u can raise the jet needle.. in ur carb.. and if u ride mostly at high speeds then ur consumption may increase sligtly but hardly by any discernible figure.. that will make sure that at full throttle mixture is a bit rich.. that is one use of slide needle..

    Quote Originally Posted by gull_s_777 View Post
    ok , here is my junoon's spark plug
    backfire issue only if i cross 100Km/h...
    i guess i am running too lean for that speed?????

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    the both plugs are showing ideal condition yar.specially junoon 1
    legend will revive soon

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    Quote Originally Posted by asjdsm View Post
    its tottally poppat .. awewsome.. no need to wory..
    however if u want to remove that popping .. u can raise the jet needle.. in ur carb.. and if u ride mostly at high speeds then ur consumption may increase sligtly but hardly by any discernible figure.. that will make sure that at full throttle mixture is a bit rich.. that is one use of slide needle..
    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
    Quote Originally Posted by hidalgo View Post
    the both plugs are showing ideal condition yar.specially junoon 1

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    ^^^Lucky man.55kmpl at 70-80kmh.(Y)
    I Am the Feel
    I Am The Yamaha!

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