Backfiring like crazy

[RuoskaNZ]

Only really noticed how major it is today after a few hours riding today but with heavy throttle usage e.g. a quick trip over the Rimutakas,
it pops away quite a bit when you let off.
I may be using the wrong terminology as when car backfires you can hear it a block away.
Am pretty sure this is abnormal whatever it is.
Is it bad for the bike at all?
And what would be causing it?

Bike is a GSX-R600 K9

Help appreciated.
inb4 "dont let off"

[Nova.]

dnt let off

[mossy1200]

Mine does that. I have practised controlling it with throttle control so it does it louder when passing girls walking along the street.

[skippa1]

excessive decel popping or backfire is most likely an exhaust leak

[RuoskaNZ]

dnt let off

Mine does that. I have practised controlling it with throttle control so it does it louder when passing girls walking along the street.

You would have to be going pretty hard around town to replicate the event.

excessive decel popping or backfire is most likely an exhaust leak

I have an aftermarket exhaust system, would there be a problem with that that is causing it?

[Road kill]

You would have to be going pretty hard around town to replicate the event.

I have an aftermarket exhaust system, would there be a problem with that that is causing it?

How long has the exhaust been on and did you have it tuned for it ?

[RuoskaNZ]

How long has the exhaust been on and did you have it tuned for it ?

I am unsure, I bought the bike as is.
Is there any way to tell if it has been done?

[Brayden]

I'm no expert but if you accelerate heavily then when you let off the backfire will be unburnt petrol because you've been giving it heaps of gas I don't think it's bad.

Also the 'popping' noise sounds bad ass I don't know why your complaining x D When you put an aftermarket exhaust on you need to the bike as it will run differently

[RuoskaNZ]

I'm no expert but if you accelerate heavily then when you let off the backfire will be unburnt petrol because you've been giving it heaps of gas I don't think it's bad.

Also the 'popping' noise sounds bad ass I don't know why your complaining x D When you put an aftermarket exhaust on you need to the bike as it will run differently

I know the general principle behind a backfire, but something causes it to happen.
It is just a little off putting really, and am worried I am doing damage to it somehow as a cause or product.
Probably a stupid worry but meh.

[Fast Eddie]

a backfire is usually like one big bang though after some rough running..

if your just getting a few baffles and muted rumblings its prob just from high revs, bits of unburnt fuel and high exhaust temps or the air rushing past the muffler or something - just having fun. race bike sounds like that all the time during decel/letting off the throttle

[DrunkenMistake]

Mine does that. I have practised controlling it with throttle control so it does it louder when passing girls walking along the street.

Hahaha im glad im not the only one,
I try time it through the main drag so just as you go past the main entrance to the mall, it echos through a bit wanky, but fin all the same

[bogan]

Technically it is an afterfire, backfires come back through the intake. Generally caused by it leaning out, then not getting ignited as it passes through the cylinder, but igniting when it hits the exhaust and contacts the flame from gas that has been ignited.

My bike is carb'd and has ACVs, air cutoff valves, which richen it up when under heavy engine braking. EFI bikes should detect the same condition, and inject more fuel.

[SMOKEU]

Being EFI the computer should sort out the fuelling for the exhaust mod.

[Berries]

It is just a little off putting really, and am worried I am doing damage to it somehow as a cause or product.
Probably a stupid worry but meh.

Mine is backfiring like a bastard now. Downhill, off the throttle, it is terrible. Looking at the corrosion on the eight year old OE downpipes and the superficial cracks in the mufflers I suspect an exhaust leak somewhere. Can't be arsed finding it though.

[bogan]

Being EFI the computer should sort out the fuelling for the exhaust mod.

I think you'll find even if it has an oxy sensor, it can only make minor adjustments, primarily there to increase the fuel efficiency across altitude/heat/humidity changes. Haven't heard of any that will successfully adjust for an aftermarket exhausts.