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Old 05-23-2007, 01:04 AM   1 links from elsewhere to this Post. Click to view. #1 (permalink)
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Thumbs down Closed throttle exhaust popping

I was just wondering if the popping sound from the exhaust while decelerating is normal?! This only happens with a closed throttle after a hard acceleration to 7K+ RPM. My FZ6 is all stock as far as intake/engine/exhaust goes and only got around 3800 miles on it. Would this be a good enough reason to have throttle bodies synced?
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Old 05-23-2007, 01:58 AM   #2 (permalink)
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Old 05-23-2007, 02:13 AM   #3 (permalink)
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Many people on this forum believe that the deceleration popping is due to a lean condition known as backfiring. A stock system should not do this, but it is common with aftermarket exhausts that have not had the fuel maps redone. I would take it to the shop if it is under warranty and have them check it out.
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Old 05-23-2007, 07:01 AM   #4 (permalink)
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Mine would sometimes pop on decel after hard accel, or if I would chop the throttle from around 5k when it is still warming up.
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Old 05-23-2007, 07:47 AM   #5 (permalink)
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Sounds lovely doesnt it
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Old 05-23-2007, 07:52 AM   #6 (permalink)
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It is caused from a lean running condition. And yes stock bikes do this. With ever tightening emissions stock motorcycles run lean, some worse than others. There is nothing a shop can due to fix this except to remap the fuel injection, which needs something like the Dynojet powercommander to do.

Understand that the bike was tested like this at the factory and is not harmful to your bike.
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Old 05-23-2007, 08:04 AM   #7 (permalink)
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I have not had this problem on my 07 but I do not slam the throttle shut usually either. This could be your problem though. You are going from high to low rpm's real fast and this does cause stresses in the engine and fuel system etc. and you will tend to backfire at times. Just a thought.

If you ride hard and still have this problem remapping is probably the answer.
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Old 05-23-2007, 09:23 AM   #8 (permalink)
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Default Fresh air induction?

Quote:
Originally Posted by seebood
I was just wondering if the popping sound from the exhaust while decelerating is normal?! This only happens with a closed throttle after a hard acceleration to 7K+ RPM. My FZ6 is all stock as far as intake/engine/exhaust goes and only got around 3800 miles on it. Would this be a good enough reason to have throttle bodies synced?
I'm new to Yamahas but my past Suzuki's all had a PAIR system. Basically it was a fresh air induction system that on heavy vacuum(decelleration) the system would dump a little fresh air into each exhaust port. This would burn any unspent gas exiting the chamber and help clean up emmissions. I suspect Yamaha has a similar system. This popping is due to the fresh air igniting the unspent fuel vapors in the exhaust.

Solution on the Suzukis was to block the flow of fresh air to the exhaust port. Popping eliminated.

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Last edited by Craigmri; 05-23-2007 at 09:25 AM.
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Old 05-23-2007, 09:30 AM   #9 (permalink)
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Its the air induction system as Craigmri says. Its just an emissions system doing its little annoying job

Dont worry about it.
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Old 05-23-2007, 12:55 PM   #10 (permalink)
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Quote:
Sounds lovely doesnt it
It does! And i'm glad to hear that this is normal... I have the Cali. version so I'm pretty sure that makes things worse also.
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