This may be a dumb question......But is it possible to put bigger carbs on a 04 500f? is it the same as rejetting? i mean performnace wise?

The answers are ... YES, YES, YES oh my god YES, Nope not easily or cheaply, Nope and heck no if you manage the second it will trump the third...
Cool.
Srinath.

Thank's for that info........i have no idea where to start

Quote from: Topher84 on April 20, 2007, 11:18:08 AM
This may be a dumb question......YES, YES, YES oh my god YES,
But is it possible to put bigger carbs on a 04 500f? - Nope not easily or cheaply,
is it the same as rejetting? - Nope,
i mean performnace wise? - heck no if you manage the second it will trump the third...

Or here it is in context ...
Cool.
Srinath.

WOW....could't have been that dumb of a question     thought this was aplace to find out info!

could have been.

That's just Srinath though. You get used to it.

[8

Don't feed the Srinath.

But seriously, don't worry about putting bigger carbs on these things, the carb's ability to flow air isn't an issue on these bikes.  If you want to really play around some more, get some Uni pod air filters, or the K&N Lunchbox (I've not dealt with pod filters before but I don't really like how the K&N Lunchbox has round holes to mate up to oval carb inlet throats but it's a doable situation) and then rejet the bike according to your new setup.  I would think that jetting info for an open air filter setup & a V&H or Jardine full system would about match that Yoshi back box and filters.  Note: If you don't want the bike to get any louder at all, leave the stock airbox in place.

Clear as mud?

I still don't know what he was saying,

I will respond, though my experience is of a entirely carb setup on a much different motorcycle.

To go to a bigger carb, could potentially offer more performance if the engine is good enough to do something with the new fuel and air its receiving. And if you did upgrade carbs, you would probably go from a CV type carb, which the GS comes with, to a Flat slide. http://www.sudco.com/keihin.html

I put Keihin Flatslides on my Ducati, and whoa did they make a difference. I loved it. It IS similar to re jetting in that it makes it possible to get more performance. I received more performance by buying these type carbs than I could get re jetting, because the design and size of this carb increases performance.

Its design is different in that the GS carb is a CV type carb which uses a vacuum operated slide. Most all motorcycles (with the exception of MX dirtbikes) have this type of carb stock. The slide, which is the portion in the carb which can be moved up and down moves up, which creates more room for air to pass, by the pull of vacuum. The higher rpm and throttle position you have, the more open this slide will be. The springs on the slide push the slide closed working against the vacuum. These are the springs that can be accessed from the top of the carb when the carb is mounted. So, the more open the airway is, which means the more the slide is pulled up out of the way, the better throttle response, and the better your bike can potentially perform. So the main difference by design between this "stock" type carb and a flat slide is how this slide is actuated.

The CV opens the slide by vacuum, a slide on a flatslide carb is directly connected to the throttle. The more you open the throttle, the more more the slide opens. This translates to better fuel response. With the vacuum actuated slide there is a delay in abrupt fuel response, waiting for the  slide to fully open. With a flatslide I gained a tremendous increase in throttle response, since the slide opens so much more quickly, the quicker more volume of air can flow into the engine, and I gain power faster.

When I moved to a Flatslide carb (FCR) I did go for a bigger carb opening (39mm) on my 750cc, and experienced a little better hp and torque. But the best gains I got out of the upgrade was Throttle response (whoa!) and torque, not so much hp. I gained probably 1-2hp more with this type carb over just rejetting. Think of it as putting a larger throttle body on your car.

Flatslides are said to be for racing, but I have had exemplary performance out of mine for street, and spirited riding. I love them.

Here is the thing with the GS. My ducati has its carbs mounted up front, in front of the cylinders, which gives it somewhat of a ram air effect. The GS's carbs are facing out of the direct flow of the wind, has a huge windblocker called the engine helping to move air around the carbs, so I don't know how much of a difference a bigger or better carb could make. Granted it would make it breathe easier which would gain to some performance gains, but I don't know if they could really do their job. Another big question is, Does the GS engine stock any potential to support these types of carbs? If not, headwork would be the first  thing that would need to be done.

Maybe Srinath knows if a stock GS engine could support bigger and better carbs.

*whimper*  I'll trade you my soul for either one of your Duc's ..............Seriously

Sorry man, They are all mine.

but I ride the GS every day!!

Hey your yosh pipe looks good.

Save the money you are trying to improve performance, and go do a track day! You will go faster that way, gaurantee. These things are a hoot on the track!

Quote from: pres589 on April 20, 2007, 01:29:09 PM
Don't feed the Srinath.

<snip>
Clear as mud?

No ... delicious as mud ... yummmm ...
Cool.
Srinath.

THANK'S MAN

I'm keepin the trusty ol' GS around when I get a Duc this summer   She's reliable, and it keeps the high mileage off the shiny new toy.  Been looking the way of a 748/749  price is about right for a certified used one and they seem pretty nice

As much as I admire people whose hobby is modifying and tearing down these poor little motors, I would have to say, get a bike with a bigger motor.  I wanted to make my Shadow into a drag bike, but the cost is outrageous compared to buying a more powerful bike out of the box. 
Good luck anyway.

Exactly.

So what do you think? Still looking at bigger carbs? did this help at all?

It did help quite a bit.....and thank's to everyone who commented on the subject..I dont think im going with the bigger carbs.  Im going to jet it abd get anew intake and see how that feels first..