Hello & Welcome to our community. Is this your first visit? Register

Thanks Thanks:  1
Likes Likes:  3
Dislikes Dislikes:  0
Page 1 of 2 12 LastLast
Results 1 to 10 of 11
  1. #1
    mgdaubo (OP)
    Junior Member
    Join Date
    Aug 2017
    Location
    Vietnam
    Posts
    19
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    sputter exhaust sound while maintaining speed

    Hello all. I tried searching but not much people talking about this issue.

    Mine is 2005 model, everything is stock except the exhaust with straight pipes mod and CAT removed. It accelerates and run fine. But while maintaining constant speed or slight deacceleration the exhaust sound sputters like a discontinuous beat sound. This happens while cruising around 3K to 5k rpm, maybe at higher rpm it is still there but I cannot hear because the beat increases proportional to rpm and it is too high to hear. I don't really feel any jerky, it is just the annoying exhaust sound. Look like it gives this sound whenever the engine has no load or light load.

    The best discussion I can find is here, it is about FZ09 and it seems to be fixed by a ECU map: Help! bike has a sputter. running out of ideas! - Page 5

    My questions: is this normal? anyone have this issue? what is the root cause and any idea to reduce it apart from trying other ECU maps?

  2. #2
    2007 FZ6 TownsendsFJR1300's Avatar
    Join Date
    Feb 2009
    Location
    Cape Coral, Florida, USA
    Posts
    10,368
    Mentioned
    46 Post(s)
    Tagged
    1 Thread(s)

    Re: sputter exhaust sound while maintaining speed

    "Straight pipes mod" as in NO muffler at all?? Basically just the header out a long or short straight pipe?

    A video posted might help, but if there's NO back pressure at all, that may be your issue.. "Leaning out".


    To your question itself, I have open Scorps, Cat still installed. The engine runs super smooth, no sputtering, backfiring.
    Last edited by TownsendsFJR1300; 01-04-2018 at 03:27 AM.
    Scott
    2007 Yamaha FZ6- BD43 headlight mod, PIAA bulbs, Stebal air horn, Scorpion SS pipes-(no DB killers), Speedohealer, HEL SS brake lines, Fenda Extenda, K&P SS re-usable oil filter, custom mounted BMW style electrical outlet(L.S.), Techmount GPS mount with handlebar bar risers/set backs, additional helmet lock, custom mod'ed seat(Spencers), Hyper light-rear running/brake light, custom radiator/fan protector, Techspec tank pads, Grip Puppies, Yamaha rear rack with custom aluminum flat rack.

  3. Likes Motogiro liked this post
  4. #3
    mgdaubo (OP)
    Junior Member
    Join Date
    Aug 2017
    Location
    Vietnam
    Posts
    19
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: sputter exhaust sound while maintaining speed

    Quote Originally Posted by TownsendsFJR1300 View Post
    "Straight pipes mod" as in NO muffler at all?? Basically just the header out a long or short straight pipe?

    A video posted might help, but if there's NO back pressure at all, that may be your issue.. "Leaning out".
    Yes, the pipe is branched to 2 smaller grid pipes (around 30mm diameter) wrapped by fiber glass then go straight out. This was done by previous owner. The sound is not good but it's not the time for it now.

    I smell rich exhaust gas when cold start and during warming up. When it is fully warm the smell gone. There is no or very less pop or backfiring, only if I ride very hard, so I don't know if it is running lean or not.

    I will plan for recording a video.

    Quote Originally Posted by TownsendsFJR1300 View Post
    To your question itself, I have open Scorps, Cat still installed. The engine runs super smooth, no sputtering, backfiring
    Thanks for your sharing.

    Can the AIS cause this annoying sound?
    I remember somewhere on this forum somebody was telling about a leak on the pipes can cause strange sound, but now I could not find that post.

  5. #4
    2007 FZ6 TownsendsFJR1300's Avatar
    Join Date
    Feb 2009
    Location
    Cape Coral, Florida, USA
    Posts
    10,368
    Mentioned
    46 Post(s)
    Tagged
    1 Thread(s)

    Re: sputter exhaust sound while maintaining speed

    Quote Originally Posted by mgdaubo View Post
    Yes, the pipe is branched to 2 smaller grid pipes (around 30mm diameter) wrapped by fiber glass then go straight out. This was done by previous owner. The sound is not good but it's not the time for it now.

    I smell rich exhaust gas when cold start and during warming up. When it is fully warm the smell gone. There is no or very less pop or backfiring, only if I ride very hard, so I don't know if it is running lean or not.

    I will plan for recording a video.


    Can the AIS cause this annoying sound?
    I remember somewhere on this forum somebody was telling about a leak on the pipes can cause strange sound, but now I could not find that post.
    Never heard of he AIS causing the sound.

    You may want to check your header NUTs at the head for tightness. I had several of mine loosen up and make an odd sound.
    If you can, feel round the header and the head when idling (rev it some ) checking for any leakage.

    Your exhaust seems to be about the same size of my open Scorp as well...
    Last edited by TownsendsFJR1300; 12-28-2017 at 05:47 AM.
    Scott
    2007 Yamaha FZ6- BD43 headlight mod, PIAA bulbs, Stebal air horn, Scorpion SS pipes-(no DB killers), Speedohealer, HEL SS brake lines, Fenda Extenda, K&P SS re-usable oil filter, custom mounted BMW style electrical outlet(L.S.), Techmount GPS mount with handlebar bar risers/set backs, additional helmet lock, custom mod'ed seat(Spencers), Hyper light-rear running/brake light, custom radiator/fan protector, Techspec tank pads, Grip Puppies, Yamaha rear rack with custom aluminum flat rack.

  6. Likes Motogiro liked this post
  7. #5
    mgdaubo (OP)
    Junior Member
    Join Date
    Aug 2017
    Location
    Vietnam
    Posts
    19
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: sputter exhaust sound while maintaining speed

    So here is the video: https://www.youtube.com/watch?v=Rf9y18LNy3g

    I mount my phone on the rear grab handle. Sorry the sound quality is not so good and the camera is looking toward sky.
    You can hear the sputter sound when I was maintaining constant speed, it was 2nd gear, 2500 ~ 3500 rpm, speed around 30-40km/h. The bike is not jerking.
    Whenever I accelerate, the sputter sound gone, then it comes back when I decelerate and maintain constant speed.

    I have just checked the head pipe nuts, they are all tight.

    Any idea?
    Last edited by mgdaubo; 12-30-2017 at 12:03 AM.

  8. #6
    2007 FZ6 TownsendsFJR1300's Avatar
    Join Date
    Feb 2009
    Location
    Cape Coral, Florida, USA
    Posts
    10,368
    Mentioned
    46 Post(s)
    Tagged
    1 Thread(s)

    Re: sputter exhaust sound while maintaining speed

    Your bike sounds normal.

    Mine sounds the same at the lower RPM's.

    Go ride!!!!!
    Scott
    2007 Yamaha FZ6- BD43 headlight mod, PIAA bulbs, Stebal air horn, Scorpion SS pipes-(no DB killers), Speedohealer, HEL SS brake lines, Fenda Extenda, K&P SS re-usable oil filter, custom mounted BMW style electrical outlet(L.S.), Techmount GPS mount with handlebar bar risers/set backs, additional helmet lock, custom mod'ed seat(Spencers), Hyper light-rear running/brake light, custom radiator/fan protector, Techspec tank pads, Grip Puppies, Yamaha rear rack with custom aluminum flat rack.

  9. #7
    mgdaubo (OP)
    Junior Member
    Join Date
    Aug 2017
    Location
    Vietnam
    Posts
    19
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: sputter exhaust sound while maintaining speed

    Quote Originally Posted by TownsendsFJR1300 View Post
    Your bike sounds normal.

    Mine sounds the same at the lower RPM's.

    Go ride!!!!!
    Thanks Scott,

    Happy to hear it is normal.

    But it is still quite annoy since most of the time I will be cruising in city with that sound. The traffic here will not allow me to rev more than 5000 rpm so often. In certain traffic conditions I usually slightly accelerate then use clutch to cruise to avoid this odd sound, but it is not convenient all the time.

    Does the stock exhaust sound like this?

    Anyway, happy new year to you all

  10. #8
    2007 FZ6 TownsendsFJR1300's Avatar
    Join Date
    Feb 2009
    Location
    Cape Coral, Florida, USA
    Posts
    10,368
    Mentioned
    46 Post(s)
    Tagged
    1 Thread(s)

    Re: sputter exhaust sound while maintaining speed

    With the stock exhaust, the bike is super quiet and sounds like a sewing machine.

    As noted earlier, yours sounds pretty close to mine (at least at those RPM's). If like mine, over 5,000 RPM's, it screams and sounds like a "go fast" liter bike.
    I can put DB killers in mine to quiet it down, but if your exhaust is home made, you may have to get /make up, etc a baffle to quiet it down...

    Re-installing the CAT may quiet it down some. I left mine on as I didn't want it any louder (and didn't have any issues what so ever).

    Your video clip didn't sound too loud to me. If under light throttle and little load, you can cruise at 3k, that'd be a little quieter.

    I usually shift at around 4K in town...


    Last edited by TownsendsFJR1300; 12-30-2017 at 10:56 AM.
    Scott
    2007 Yamaha FZ6- BD43 headlight mod, PIAA bulbs, Stebal air horn, Scorpion SS pipes-(no DB killers), Speedohealer, HEL SS brake lines, Fenda Extenda, K&P SS re-usable oil filter, custom mounted BMW style electrical outlet(L.S.), Techmount GPS mount with handlebar bar risers/set backs, additional helmet lock, custom mod'ed seat(Spencers), Hyper light-rear running/brake light, custom radiator/fan protector, Techspec tank pads, Grip Puppies, Yamaha rear rack with custom aluminum flat rack.

  11. #9
    mgdaubo (OP)
    Junior Member
    Join Date
    Aug 2017
    Location
    Vietnam
    Posts
    19
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Re: sputter exhaust sound while maintaining speed

    Quote Originally Posted by TownsendsFJR1300 View Post
    With the stock exhaust, the bike is super quiet and sounds like a sewing machine.

    As noted earlier, yours sounds pretty close to mine (at least at those RPM's). If like mine, over 5,000 RPM's, it screams and sounds like a "go fast" liter bike.
    I can put DB killers in mine to quiet it down, but if your exhaust is home made, you may have to get /make up, etc a baffle to quiet it down...

    Re-installing the CAT may quiet it down some. I left mine on as I didn't want it any louder (and didn't have any issues what so ever).

    Your video clip didn't sound too loud to me. If under light throttle and little load, you can cruise at 3k, that'd be a little quieter.

    I usually shift at around 4K in town...
    Mine sounds screaming at over 5000 rpm, and in town I shift at 4000 rpm, too.
    So I guess I will live with this sputter sound at low rpm.

    I've just measure again my pipes, they are 40mm diameter. Actually I want the sound a little bit quieter, so maybe I will try some silencer to reduce the opening to 30mm.

    Thank you again, Scott.
    Happy new year

  12. Thanks TownsendsFJR1300 thanked for this post
  13. #10
    Super Member sputter exhaust sound while maintaining speed ShoopCE's Avatar
    Join Date
    Sep 2013
    Location
    Parkersburg, WV
    Posts
    434
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)

    Re: sputter exhaust sound while maintaining speed

    I agree with Scott. I think that sound is fairly normal.

    I have a stock muffler that a previous owner partially gutted. He did a good job and the sound is nicer and deeper and doesn't sound like an open can. I also get that sputter sound when backing off of the throttle. I call it a chuckle and sort of like that sound. The chuckle or sputter might be enhanced because you have very little back pressure on the pipes. Same but less so for Scott's or my bike. I don't know if a bike with a stock pipe will make that sound, so this is just a theory.

    If the lack of back pressure causes this sound then a diameter restriction will increase the back pressure and that might reduce the sputter a bit. A simple diameter restriction will not reduce the sound volume very much.

    Good luck!

    Chris
    2008 FZ6 Cobalt Blue
    R6 forks, R6 Mirrors, MRA Vario windscreen, ThrottleMeister, Shogun frame sliders, SpeedoDRD, Corbin GF&Lady w backrest, R&G FE

  14. Likes TownsendsFJR1300 liked this post
 

 
Page 1 of 2 12 LastLast

Similar Threads

  1. Exhaust sound: Stock vs Leo Vince
    By Erci in forum FZ6 General Discussion
    Replies: 16
    Last Post: 11-23-2010, 12:29 AM
  2. Low speed 1t+2nd gear - pop sound in maybe gear area ?
    By getsum in forum Garage / Mechanical Help
    Replies: 2
    Last Post: 09-18-2010, 03:14 PM
  3. FZ6 Exhaust Sound Level
    By bd43 in forum FZ6 Technical
    Replies: 14
    Last Post: 09-01-2008, 03:54 PM
  4. Stock Exhaust sound...
    By stevesnj in forum FZ6 General Discussion
    Replies: 23
    Last Post: 05-15-2008, 08:12 AM
  5. Stock Exhaust sound?
    By teslas in forum FZ6 General Discussion
    Replies: 2
    Last Post: 03-06-2008, 04:30 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
All times are GMT -7. The time now is 06:51 PM.
4.2.5
Image resizer by SevenSkins
Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like v3.6.3 (Lite) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright 2007 , All content is property of 600Riders.Com All Rights Reserved. The opinions and posts on this site do not neccesarily reflect those of the site owners or operators.
Yamaha FZ6 and Yamaha rights are property of Yamaha Motor Company. 600Riders.com is not associated with Yamaha in any way. We are an enthusiast site dedicated to the Yamaha FZ6 motorcycles. Our goal is to offer a place for Yamaha FZ6 owners to discuss rides, events, mods, maintenance, purchasing, etc
vBulletin Skin By: PurevB.com