exhaust pulses .. is there a problem ?
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Thread: exhaust pulses .. is there a problem ?

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    Default exhaust pulses .. is there a problem ?

    hello brotheres and great forum i parked my bike for about 2 month and when i satrted riding again i heard somne weird pulses developed from the exhaust i cannot be sure if this sound existed before or just something new my workshop told me it may be from cobrapwr pro dumping much fuel or may be the spark plugs need to change or bad spark plug i changed the spark plugs and the sound still exists some times it appeares that this pulses comes from the rear cyclinder the bike is only 10k 2007 i wonder if this is natural sound or something need to be adjusted like bad injector or valve or pistons sync needed ...etc i have cobra pwrpro black and its default setting is 4% when i take it down to zero% the sound disappeared but this means i will be so lean with k&n filters and cobra speedster longs i tried to unblock the pair valve but nothing changed so i blocked it back here is the sound would some body help identifing is ther e any problem or thats normal " pulses " sound (hear the sound in the video from 18 :00 sec)https://www.youtube.com/watch?v=ZnMlHyJAR68

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    Very Active Member biker-chicky's Avatar
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    Hmm, have you taken for a good long ride yet? Did you put any gas storage conditioner in it? Have you changed the fuel filter sock? Have you put a bit of gas line antifreeze in the tank in case water is in the gas? Was the battery disconnected at any point or has gone dead during the 2 months?


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    Quote Originally Posted by biker-chicky View Post
    Hmm, have you taken for a good long ride yet?not long just around the city but not too long Did you put any gas storage conditioner in it?nope i didnt Have you changed the fuel filter sock?yes but thats was from 6 month agog i changed it with new one Have you put a bit of gas line antifreeze in the tank in case water is in the gas?nope. i didnt Was the battery disconnected at any point or has gone dead during the 2 months? yes it dead during that period and i charged it Sent from my iPad using TapatalkVegas Meet May 17-24, 2017! Let's bet on a great time!http://www.m109riders.com/forums/sho...d.php?t=321882
    Hmm, have you taken for a good long ride yet?not long just around the city but not too long Did you put any gas storage conditioner in it?nope i didnt Have you changed the fuel filter sock?yes but thats was from 6 month agog i changed it with new one Have you put a bit of gas line antifreeze in the tank in case water is in the gas?nope. i didnt Was the battery disconnected at any point or has gone dead during the 2 months? yes it dead during that period and i charged it then plugged it back after 2 days so can you tell me what that sound means ? or what i can do as service now thanx alot for help
    Last edited by redadeath; 2 Weeks Ago at 12:09 PM.

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    Quote Originally Posted by redadeath View Post
    Hmm, have you taken for a good long ride yet?not long just around the city but not too long Did you put any gas storage conditioner in it?nope i didnt Have you changed the fuel filter sock?yes but thats was from 6 month agog i changed it with new one Have you put a bit of gas line antifreeze in the tank in case water is in the gas?nope. i didnt Was the battery disconnected at any point or has gone dead during the 2 months? yes it dead during that period and i charged it then plugged it back after 2 days so can you tell me what that sound means ? or what i can do as service now thanx alot for help
    Well, my gutt still says it's the gas, can you ride out the old gas and put in the best high octane on you next fill up. Once you do that. Then maybe others might have some suggestions. I don't have the mods you do, so I'm going by the basics.


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    Two months is not long enough to cause gasoline to deteriorate enough to cause running problems. Mine sits for longer than that during the cold months and I never put anything in the gas for storage, except a bit of Marvel Mystery Oil. Maybe if the fuel is a high ethanol content, it could absorb some water. I wouldn't even ride it if I though the gas was bad. I have one of those squeeze bulbs that you use to siphon gas. Empty the tank, put some known good gas in it and see what happens. Put the old gas in your cage, unless it's a high performance cage. Then use it in the lawn mower.
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    Quote Originally Posted by cbxer55 View Post
    Two months is not long enough to cause gasoline to deteriorate enough to cause running problems. Mine sits for longer than that during the cold months and I never put anything in the gas for storage, except a bit of Marvel Mystery Oil. Maybe if the fuel is a high ethanol content, it could absorb some water. I wouldn't even ride it if I though the gas was bad. I have one of those squeeze bulbs that you use to siphon gas. Empty the tank, put some known good gas in it and see what happens. Put the old gas in your cage, unless it's a high performance cage. Then use it in the lawn mower.
    thank you for your reply so is that sound "pulses" just a gas problem related ? or may be something else need to be checked or adjusted .thanx alot
    Last edited by redadeath; 2 Weeks Ago at 09:13 PM.

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    NOTE: I HAVE SMALL EXHAUST LEAK at the last extension of the exhaust pipewich attached to the rear cylinder the leak is just before the baffles section ... would that contribute to the problem ... i got no back firing at all during riding ?

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    any ideas?

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    I get the feeling that it may not be much of concern or maybe some guy was trying to get you all freaked out about nothing. Personally I don't hear anything to be concerned about. The bike is fuel injected, the computer makes adjustments automatically. Ride it my friend and when your due for your next service take it to a different dealer and ask what they think of the sound.


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    It's a simple misfire as I hear it. I would run the old fuel out (2 months is enough time for fuel to go bad because you have no idea how long it sat around before you put it in), put in some fresh fuel with some cleaner additive (brand doesn't really matter, just a fuel/combustion chamber cleaner) and ride it.

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    i added cycle max 44 cleaner to the tank on fresh fuel it seems the same

    the bike once stalled during idle and it got suspicious about cleaning my k&N filters that may make my fuel mixture rich as i can get some black smoke when i start the bike and alot of gas smell ... beside the pp tuner that enrich my mixture


    since the sound disappears when i get down the first settings from 4% TO ZERO WITHIN THE POWER PRO so i will update after cleaning the filters

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    Quote Originally Posted by redadeath View Post
    i added cycle max 44 cleaner to the tank on fresh fuel it seems the same

    the bike once stalled during idle and it got suspicious about cleaning my k&N filters that may make my fuel mixture rich as i can get some black smoke when i start the bike and alot of gas smell ... beside the pp tuner that enrich my mixture


    since the sound disappears when i get down the first settings from 4% TO ZERO WITHIN THE POWER PRO so i will update after cleaning the filters
    No matter how open the filter system is, there is really not much reason to richen the mixture at idle. There's so little air flowing that the filters matter not.

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