A short clip & backfiring question

instigator · Super Spammer Joined: 19 Oct 2004 Karma :

Alright peeps.

See attached clip of my bike with a new exhaust on it. Excuse the shitty quality of it, was using an older fuji 2800z digital camera.

Just one question, is it supposed/is it okay to backfire/cough like that when I was slowing down coming towards the camera?

Just, the old exhaust didn't do it. I assume its just running a bit richer or something along those lines.

P.S You'll probably hear my failed wheelie attempt from the pitch of the exhaust, although my bike just appears as a blob of grey on the screen. Laughing

https://s7.yousendit.com/d.aspx?id=3A602CA9AD7C872EF963AF6A5B025BAC Just let it download from the site. Should do it automatically. About 7.5mb long.

Dom_ · Points Mean Prizes Joined: 02 Aug 2004 Karma :

Sounds like most bikes ive heard with an aftermarket exhaust. You wanna hear a lad i know's ccm640 with a remus can, it sounds like gunshots are being fired when he pulls up to traffic lights!

Its not backfiring, its just unburnt fuel in the exhaust igniting. Backfiring is when the burnt fuel/air mixture is forced out throught the carbs with a puff off smoke.

instigator · Super Spammer Joined: 19 Oct 2004 Karma :

F*ck it, I'll just upload it.

Jrod · Page 3 Girl Joined: 02 Aug 2004 Karma :

You wanna hear Yams WR!!!! Scared shit outta me first time I followed him when it backfired at me Neutral

Still scares me when i'm behind him and it backfires!

Sparks! · Sir Tart-a-lot Joined: 30 Aug 2003 Karma :

That sounds cool for an ER-5 Thumbs Up

Backfiring/burbling whatever is perfectly normal and great for scaring old ladies and children when riding through town Twisted Evil

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hustler · Crazy Courier Joined: 29 Jul 2004 Karma :

Nice stretch of road there too
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Keith · World Chat Champion Joined: 24 Mar 2004 Karma :

That sounds very sexy I must say. Thumbs Up

(Dodsi, take note and buy one, now!)

Instigator, how much did the can cost?

Also, did you make any carb modifications to make up for increased exhaust flow or wasnt it necessary?
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instigator · Super Spammer Joined: 19 Oct 2004 Karma :

Hmm, the bikes still restricted to 33bhp so far, and it ahs no mods made to the carb, although it probably should do, after almost halfing the power and putting on a different exhaust is bound to have upset something. No idea if its supposed to be rejetted or whatever when you put it on, but it runs very smoothly and I feel the bikes a bit smoother now.

Got the exhaust off ebay for £80 including £15 p&p, so I was well chuffed with that. This is the first time I'd seen a remus exhaust up on ebay for the er5, and it had 2 bids on it with 9 days to go, standing at £32. Foolishly, the seller ended the auction for me, whereas he could have probably sold it for about £150.

After interest from a bmw traffic cop the other day(he didn't find me), I'll leave it restricted for yet another couple of weeks.

tank · Nova Slayer Joined: 05 Oct 2003 Karma :

your backfiring is caused by a lean pilot circuit after fitting the aftermarket exhaust ,not much to worry about unless you want to knacker the exhaust packing slowing down using high revs on overrun the yamaha wr are really bad for this fault but very easy to sort out .

bugsy46 · Village Idiot Joined: 16 Mar 2004 Karma :

We used to let the bike run a little richer to cure unwanted popping Thumbs Up

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gsxrpeak · Trackday Trickster Joined: 06 Apr 2005 Karma :

when my zzr backfires a big flame shoots out and it make a huge bang!
Laughing

you shoudl see the buss stop people when i go past! BANG BANG

ahhhhhhhhhh asume crunch position!
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binge · Emo Kiddy Joined: 02 Jul 2004 Karma :

Sometimes when I come off the throttle too quickley on my speedfight it get a:
"Pop, Pop, Pop, Pop, Pop, BANG"

Not sure why because the plug look fine. Confused

Looks and sounds cool in the dark though. a bout 6" flame sticking out of the End can!

<|Ben|>

mchaggis · World Chat Champion Joined: 09 May 2004 Karma :

You've probably an air leak. I assume your speedfight has a quickrot mild steel exhaust?
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BlueNinja · Trackday Trickster Joined: 14 Dec 2004 Karma :

Anyone know how to make their bikes pop like that naturally? not kill-switch version.. Just I love that sound Smile

Sorry for tarty question
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loply · World Chat Champion Joined: 24 Mar 2004 Karma :

Mine doesnt it all the time when Im slowing down or changing up gears slowly.

Usually not that loud though.
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gsxrpeak · Trackday Trickster Joined: 06 Apr 2005 Karma :

red line then let go of the throtle, wait for the bang!
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Synnister1 · Nova Slayer Joined: 07 May 2005 Karma :

The back fire is down to the mixture getting lean.
The new zorst probally lets more gas flow so, you need to richen the mixture to compensate.
To do this proper you need to stick it on a Dyno.
In bad cases, lean mixture can burn the valves and cause overheating ect
You may have taken the power above your restriter limit too?
Just my bit of knowlege, ignore me and I go away Laughing