Aftermarket exhausts on FI.

[P.]

Hey...
Looking over the 2010 "sports" bikes..
Obviously with fuel injection, what happens with say end can replacement? Does it affect it.

Also looking at this bike.. with its hideous excuse for an exhaust..
https://www.yamaha-motor.co.uk/Images/2010-yamaha-YZF-R125_BWC1_colour_studio_001_prv_tcm46-325895.jpg
obviously highly frowned upon here...but how simple with about £400 is it to get a high level exhaust/hangar on the rear foot pegs?

Obviously a longer pipe would need to be added, but would this cause power loss/exhaust trouble?

Just curious

[Paulington]

My SV650 now idles lower with the aftermarket endcan, also has a nasty habit when warm of if you rev it very slightly to move in town, it can cut out due to really low idle.

Can't be arsed to turn it back up.
____________________
"Four wheels move the body, two wheels move the soul."
Current Vehicles: '89 Kawasaki KDX200, '99 Yamaha XV535, '00 Honda ST1100 Pan-European, '08 Suzuki GSX-R1000, '08 Mitsubishi Lancer GS4 2.0 TDCi, '15 BMW 1 Series 116d Sport Turbo.
CBT: 27/08/08. Theory: 04/09/09. Module 1: 16/09/09. Module 2: 01/10/09.

[Spit-Fire]

are you asking if a high end can will change power out put?

or

if after market end cans effect fuelling?
____________________
they say the good die young... i say we just live faster

[P.]

[G]

If it's an official one, then you will often get an official map for it - for instance I got the KTM Akrapovic map put on my 690 after I got the exhaust on ebay.

Oh and that's not a sports bike, it's a faired tarty's commuter .

If it's not official, such as your desire for a possibly bespoke system, you may need some kind of fi controller - however not sure they make them for small bikes as such.

The offer of a play on my bike's still open if you're down this way some time if you want to try at least a properly 'sporty' commuter .

[P.]

[Kickstart]

Hi

Fueling will depend on the fuel injection system. Some will not have a lambda probe so can do nothing to compensate, some might only use the lambda probe for feedback at some revs and go to mapped settings at high revs.

Longer exhaust will likely work better at lower revs and worse at higher revs.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Paulington]

That sounds pants.

Get an RS125 if you're really going for the sports look, near equal fuel economy if ridden conservatively and you don't look like you're pretending you're on an R6.

Also, much more fun if you do want to give it a go.
____________________
"Four wheels move the body, two wheels move the soul."
Current Vehicles: '89 Kawasaki KDX200, '99 Yamaha XV535, '00 Honda ST1100 Pan-European, '08 Suzuki GSX-R1000, '08 Mitsubishi Lancer GS4 2.0 TDCi, '15 BMW 1 Series 116d Sport Turbo.
CBT: 27/08/08. Theory: 04/09/09. Module 1: 16/09/09. Module 2: 01/10/09.

[P.]

[dodger]

When I fitted my Termi's the fueling at low revs was much improved, rather than it just chugging along until the revs finally picked up. Now it pulls like a train in any gear.

Plus they look like the dogs proverbials and sound like Thor himself, which is obviously the main reason for getting aftermarket exhausts...
____________________
My Bikes: Piaggio NRG| Aprilia RS 125| Suzuki GSX-R 600|Yamaha Fazer Ducati 848
Europe 2008

[Paulington]

Ah-ha, in that case yes, G is right.

If it's an Akra/Yoshi/well known make, you may very well be able to get a new map put on designed for that specific exhaust.

If you had a PCIII or similar, there are plenty of maps out there for all kinds of exhausts.

It wouldn't make that much of a difference I imagine, like I said my SV just idles a little lower.
____________________
"Four wheels move the body, two wheels move the soul."
Current Vehicles: '89 Kawasaki KDX200, '99 Yamaha XV535, '00 Honda ST1100 Pan-European, '08 Suzuki GSX-R1000, '08 Mitsubishi Lancer GS4 2.0 TDCi, '15 BMW 1 Series 116d Sport Turbo.
CBT: 27/08/08. Theory: 04/09/09. Module 1: 16/09/09. Module 2: 01/10/09.

[G]

Feel free, my sofa is always available - though it should be easily do-able in a day - I got down to the south coast, had a few minutes in the air, sat around for ages in a car, rode slowly to Hastings, had BBQ, rode back and still was home a decent chunk before sunset .

[P.]

[G]

I'm in Reading - M4 J12 - even the 125 could manage it, but yes a car would seem more sensible. I've often popped down to brands hatch for a day, bike, car and van.

[P.]

[DrDonnyBrago]

[P.]

[G]

I should hopefully be down at the South Coast on a weekend at some point in the next few weeks - if so will be riding down, but not using the bike in the day. Also, conveniently, will only likely be down on a day with decent weather.

[P.]

[Sam_Y_93]

[P.]

[Sam_Y_93]

well the r125 uses a 1.5" link pipe (I believe) so im guessing he got hold of a disc saw and a welder.

I hope he done it out of shear boredom, and had a spare pipe and end can and doesn't actually think its any good

there is also one with a cbr exhaust fitted, which I quite like the idea of an underseat exhaust but its still shocking
https://www.youtube.com/watch?v=yBC-3J3c1E4&feature=related
____________________
Bikes Past: Yamaha Aerox (sold) Yamaha R125 (written off)
Bikes Current: Honda VFR 400 (awaiting restoration) Honda CB600f F-4
Theory passed July 21st Mod1 passed August 3rd Mod 2 passed 26th August

[P.]

[Sam_Y_93]

Im guessing so, end can doesn't come off on an r125 so must of done
____________________
Bikes Past: Yamaha Aerox (sold) Yamaha R125 (written off)
Bikes Current: Honda VFR 400 (awaiting restoration) Honda CB600f F-4
Theory passed July 21st Mod1 passed August 3rd Mod 2 passed 26th August

[P.]