Exhaust 'popping' on overrun

deafwish · Post by **deafwish** » Mon Dec 18, 2006 8:34 pm

Hi again, folks.

I finally got my bike registered and passed it's VIV inspection! WOOT!

I am happier than a pig in shat!

I was speaking with Wattie, the other day about a weird thing my bike is doing.
When there is some temperature in the exhaust (riding hard), I shut the throttle off and then open it again (getting back on the gas), the bike makes a 'popping/ crackle' sound out from the exhaust.
Wattie told me it was the KLEEN system that needed to be plugged up, as it was injecting fresh air into the exhaust (emissions crap) and causing it to ignite/ pop.
It makes me feel like more of a man when my bike 'crackles' and want to know if it is doing my bike any harm to let it crackle it's little heart out?
With the KLEEN system still enabled, is it true that it is hard to read correct AFR's on the dyno?

Cheers!
Daz.

mike-s · Post by **mike-s** » Mon Dec 18, 2006 8:40 pm

nah not doing it any harm.

My bike used to do it after i put a new exhaust on, even when running OEM jets with dynojet needles on the bike.

mate used to have a srx600, now THAT thing had a drainpipe of a staintune as an exhaust, when you backed off, i swear that air got sucked back down into the pipe and you could hear the popcorn being made in the link pipe!

Barrabob · Post by **Barrabob** » Mon Dec 18, 2006 8:45 pm

I found all that crackling rather annoying and had the kleen system disabled so i could hear my engine which I thought was a major improvement.

there aren't any issues I know of its just unburnt fuel being re burnt in the exhaust.

deafwish · Post by **deafwish** » Mon Dec 18, 2006 9:13 pm

Thanks, fellas.
Does the KLEEN system create flames when it crackles? I think that could cause a little more attention than I'm chasing.....
Anyone know the truth about KLEEN giving false AFR's on the dyno?

Post by **Wattie** » Tue Dec 19, 2006 6:56 am

i cant say for a fact that it affects it, but it would make it look leaner than it actually is.

you'd need to do back to back dyno runs to prove it.

putting more air into the exhaust than is actually going through the engine

Post by **MadKaw** » Tue Dec 19, 2006 7:21 am

Wattie wrote:i cant say for a fact that it affects it, but it would make it look leaner than it actually is.

you'd need to do back to back dyno runs to prove it.

putting more air into the exhaust than is actually going through the engine

Made no difference on the 10 as we had 3 of em at the dyno day and the a/f was the same on all of em, mine was the only one with the KLEEN removed... it also had the most HP..

Glen · Post by **Glen** » Tue Dec 19, 2006 7:22 am

The ZX10 does it like a bastard although it's more of a FCUKEN'BANG than a crackle. The first time it happens you get some real brown action happening downstairs but once your used to it it's OK. Handy for alerting cyclists on the Old Road that your approaching

(in a caring kind of way of course). When I eventually do my quick action throttle I'll probably plug it up.

Oh and mine's the slow one from the Dyno day

deafwish · Post by **deafwish** » Tue Dec 19, 2006 7:53 am

Thanks for all your responses.
I'll probably leave it connected, for now.

MickLC · Post by **MickLC** » Tue Dec 19, 2006 8:04 am

...and I have been reliably informed that when my 10 does it there is a small flame out of the exhaust...and mine was the average one on the dyno day

deafwish · Post by **deafwish** » Tue Dec 19, 2006 8:10 am

Mick C wrote:...and I have been reliably informed that when my 10 does it there is a small flame out of the exhaust...and mine was the average one on the dyno day

Do you still run the KLEEN or is it disabled?

MickLC · Post by **MickLC** » Tue Dec 19, 2006 8:12 am

It's still connected.

Post by **Wattie** » Tue Dec 19, 2006 10:23 am

http://www.youtube.com/watch?v=dyuaKMSx5Fs

found this on riderforums.... if mine did this i'd be keeping it...

deafwish · Post by **deafwish** » Tue Dec 19, 2006 3:22 pm

Hahaha!
Love the music!

Slow and wobbly · Post by **Slow and wobbly** » Tue Dec 19, 2006 9:41 pm

Couple of years ago at the Island the Foggy Petronas machines were shooting a 4 to 5 foot flame out the exhaust as they braked into turn 2. Awesome to see - and amusing to watch the reactions of the following riders!

Kinda like this, but heaps bigger.

Gosling1 · Post by **Gosling1** » Tue Dec 19, 2006 10:11 pm

Slow and wobbly wrote:....Kinda like this, but heaps bigger.

......why is this reminding me of some sort of homo-erotic joke about Duane ?????

(sorry mate, I haven't seen a dick and/or donut joke for days......its killing me.....)