Flaming exhaust

Mox · L Plate Warrior Joined: 11 May 2010 Karma :

Hi all, my exhaust flames when shifting up through the gears. What causes this? It is an aftermarket performance exhaust.
I know that it would be unburnt fuel igniting.
Is this a bad thing for the engine?

It sure looks cool, but I don't want to bugger up the bike.
VFR400 NC30

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

are we talking the odd little flash, or FLAMES!?

If its fire, then youll need to check your carburation.
____________________
Some shite cruiser. Now with guns and FREEDOM!

DJH · Trackday Trickster Joined: 09 Jun 2010 Karma :

How big are the flames? Pics needed mate. Cool

Paxovasa · World Chat Champion Joined: 25 Apr 2010 Karma :

You will need to sort out the mixture setting.
____________________
Suzuki GSF600 K3 (in the fastest colour, black).

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

if its a loud pipe, its not unusual to get a few little flashes as when the engine is on the overrun with the throttle closed, unburnt fuel (you will always have a little) collects and combusts in the pipe.
____________________
Some shite cruiser. Now with guns and FREEDOM!

MonkeyKnuckle · World Chat Champion Joined: 11 Jan 2009 Karma :

My old CBR600F used to do it when revving high. Looked cool as. Cool

It was just a little flash, not a flamethrower type jobby.

No idea if my new bike does it but it's an underseat pipe so I'd be worried about setting my arse on fire. Laughing

____________________
MKGaming.com
2000 Honda CBR600F - Sold! 2003 Honda CBR600RR - Current!

tutton · World Chat Champion Joined: 04 Jan 2008 Karma :

Thought flames up top of revs are it running lean?
as when you touch the limiter it stops the fuelling and is still getting cack loads of air?
Coming down through on over run as well, its getting minimal fuel but loads of air?
____________________
Past: '05 Peugeot XPS '99 Aprillia RS125 '94 FZR600R
Current: '02 ZX636 A1P '51 CCM R30

Walloper · Super Spammer Joined: 24 Feb 2005 Karma :

It is a common problem with those auld Petronas' FP1 Roadsters. Smile

For sure it's a carburettion issue.
The carbs should be tuned to the exhaust by rights.
Most folk don't bother as tuning has no effect whatsoevah on how much noise the endcan permits. (Which seems to be the main reason for fitting after market exhausts.) Razz

____________________
W-ireless A-rtificial L-ifeform L-imited to O-bservation P-eacekeeping and E-fficient R-epair

Pickledswede · Traffic Copper Joined: 15 Jul 2008 Karma :

Just noticed the advert at the bottom of this thread...

Exhaust Flaming flamer kit

99p buy it now! Laughing