Bit of a silly question..

[Bike_craze1]

This may sound stupid, but do bikes use anymore/much more petrol with twin exhausts, than a single one?
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Yamaha R125 - Cagiva Mito 125 - Honda CBR 600
CBT passed: 22/07/08 Bike Theory passed: 28/03/09
Bike Test passed: 15/04/09

[Paulington]

Use much more what?
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"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.

[Bike_craze1]

Petrol.
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Yamaha R125 - Cagiva Mito 125 - Honda CBR 600
CBT passed: 22/07/08 Bike Theory passed: 28/03/09
Bike Test passed: 15/04/09

[mooserx]

Surely it depends on your riding style, take it steady and it sips it like a butterfly drinking nectar, give it a handful and it drinks juice like a thirsty elephant. Pretty sure 2 exhausts makes no odds and its just they way the bike was made.
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TL1000r-handful.

[Paulington]

Absolutely no difference whatsoever. Generally it's the cubic capacity (cc) and the way it's ridden that determine fuel usage.
____________________
"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.

[chris-red]

[Paulington]

[chris-red]

[Frost]

Typically a single exhaust system such as a 4 into 1 will provide more back pressure giving better mid range power. A dual exhaust system like a 4 into 2 will be more free flowing and give potentially more peak power, this will often come at the cost of some mid range power. These changes may cause you to ride the bike differently and change up a gear slightly later on the twin exhaust system using a little more fuel. I'd be suprised if there were more than 0.1 mpg in it though.

Bike fuel usage is:

Gas throughput * efficiency.

Gas throughput is the bikes capacity times it's current revs.
Short stroke engines like those found in sports bikes rev higher giving greater gas throughput, and lose efficiency due to a less efficient cumbustion area shape.

Due to its smaller cylinder size a little bike will consume very little fuel when ridden slowly, but this can increase drastically when revved hard.
A bigger bike will of course use more fuel than the little bike at the same revs, but it shouldn't be neccisary to rev it hard as often as the smaller bike.

[Polarbear]

[the grim reaper]

A bikes fuel economy will be affected by all of these factors and many more. What you need to remember is that all of these items affect the flow of fuel/air into the cylinders and gas/air out of it.

Putting a free-er flowing can, air filter and upping the jetting size allows faster flow through the engine, more fuel to be mixed with the faster moving (higher pressure) air and creates more power.

This will affect fuel economy but not to a huge extent. The exhaust design will restrict how quickly the gasses are allowed to leave the engine and so will have an input but the quality of the design will have more effect than whether there is one or two cans.

Cheers

Grim
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Adverts don't always work: Remember that advert, where the army are running across the desert and they have a wounded man on a stretcher. They get to a ravine, the bridge is down and a caption pops up that says, 'What are you thinking?'. I don't know about you but I was thinking, 'Christ, I'm glad I'm not in the f***ing army'.

[Frost]

You can get a twin can system for an SRX 600. Utterly pointless when its a single!

https://www.srx600.f2s.com/srx600/exhausts/images/over2.jpg

[the grim reaper]

[Faldo]

[Mystery]

it shouldn't because theres still 4 - 6 valves coming out of the engine but there just 2-3 valves into two exhausts or 4-6 valves into one exhaust
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Carbon knuckles assure you maximum protect against debris and unfortunate accidents or if someone cuts you off, their side mirror.Mopeds are like chubby chicks.. they are really fun to ride until you're friends catch you on one

[ms51ves3]