Hi everyone,

I'm new to the message board and road riding, I used to ride trail bikes a bit and now that the Australian laws finally let me ride on the road (you have to have your provisional car license for a year before you can get bike license), I have purchased a 2002 GS500 for a first road bike.

The bike still has the stock exhaust on it, which i don't like the sound of, so I want to replace it with a slip on exhaust or a full system. I don't know much about motorcycle exhausts, but was looking at the Yoshi TRS or a Vance and Hines supersport system, if i was to go with one of those, would i need to re-jet the carbies and also get a higher performance air filter (like a K&N or something similar)?

If so, is there any particular brand of jets i should be looking at? And if anyone has any opinions, please do share, because like i said, I'm new to road bikes and making modifying them.

Cheers,
Martin

Go for the Yoshi! You'll want to rejet. You don't have to get a new filter if you're only doing it for sound, but at this point you're 95% of the way to some extra power, so there's no reason not to just toss a new filter in there to let it breathe better.

Not sure about the brands of jets, I've heard people say to stay away from the dynojet kits. There's someone on this forum by the name of Buddha, and as far as I can tell he's the best one to get your jets from, just let him know what you've got and he'll set you up with the right jets.

Welcome to the forum!

Thanks, I'll have a chat to him and see what he thinks.

Twisted, down here in Brisvegas, put on a Scream'n Demon exhaust, didn't reject and his bike is running fine. Even posted pics of his plugs as Proof it's running fine.

Michael

in Queensland you only have to hold an Australian licence for 1 year before getting your bike licence.

there is a guy here that rides a Busa on an open bike but cant drive a turbo car cause he only got his P's bahahaha

haha yeah, im in Queensland and one of my mates is going to get a GSXR600 or a ZX9-R in the next couple months, and he still cant drive a turbo car or a v8 because he's on his Ps

very well thought out laws we have in Queensland.... lol

Hey Marty, where abouts in Qld are ya? Drop in to the Aust section here at http://gstwins.com/gsboard/index.php?board=9.0 and say hello too.

Michael

Im up near Gladstone in central QLD

As Mister said I got one of these from eBay and have not regretted it.

http://cgi.ebay.com.au/Suzuki-GS500-GS-500-E-F-SDR-Black-Oval-Sports-Exhaust-/160524111702?pt=AU_Motorcycle_Parts_Accessories&hash=item255ffb8f56

I did not have to rejet and kept the stock airbox. I pulled the plugs after a long run and they were brown, so no lean issues. Increased acceleration and awesome sound. Not crazy annoying loud when your puttering around, it purrs then when you open the throttle it gets angry and roars. And on deceleration in lower gears you get that awesome snap, crackle and pop that makes you grin like a psycho.



Picture with it installed on my GS

Ah that gives me something to think about, looks good, sounds good, increased acceleration and cheaper that doing the air filter, jets and the exhaust all together.

I definitely need a better sound than the stock one, went riding with dad today and his bike's sound put mine to shame lol

Quote from: Twisted on January 01, 2011, 12:56:55 AM
As Mister said I got one of these from eBay and have not regretted it.

http://cgi.ebay.com.au/Suzuki-GS500-GS-500-E-F-SDR-Black-Oval-Sports-Exhaust-/160524111702?pt=AU_Motorcycle_Parts_Accessories&hash=item255ffb8f56

I did not have to rejet and kept the stock airbox. I pulled the plugs after a long run and they were brown, so no lean issues. Increased acceleration and awesome sound. Not crazy annoying loud when your puttering around, it purrs then when you open the throttle it gets angry and roars. And on deceleration in lower gears you get that awesome snap, crackle and pop that makes you grin like a psycho.



Picture with it installed on my GS

Quote from: Mart3y on January 01, 2011, 02:37:20 AM
Ah that gives me something to think about, looks good, sounds good, increased acceleration and cheaper that doing the air filter, jets and the exhaust all together.

Hey Mart3y,

If you don't have to rejet to get the bike running properly with a new exhaust, then the new exhaust is not giving you anything but noise. No performance improvement at all. Simple physics. But, hey, if noise is all you're after....

...ken...

In a couple weeks I'll have the money to do it all, so I will most likely be doing it all at once

Goodluck with it. Post some pics and give us a review on it all when u take it for a spin. 

Quote from: Ken in Regina on January 01, 2011, 11:22:00 AM

Hey Mart3y,

If you don't have to rejet to get the bike running properly with a new exhaust, then the new exhaust is not giving you anything but noise. No performance improvement at all. Simple physics. But, hey, if noise is all you're after....

...ken...

BE GONE TROLL!!!!!! PHYSICS HAS NO PLACE IN EXHAUST THREADS!!!!!

It is a fact that a new exhaust causes faster acceleration, better gas mileage, shorter braking distances, and brighter headlights.

Quote from: XealotX on January 02, 2011, 08:29:59 AM

Quote from: Ken in Regina on January 01, 2011, 11:22:00 AM

Hey Mart3y,

If you don't have to rejet to get the bike running properly with a new exhaust, then the new exhaust is not giving you anything but noise. No performance improvement at all. Simple physics. But, hey, if noise is all you're after....

...ken...

BE GONE TROLL!!!!!! PHYSICS HAS NO PLACE IN EXHAUST THREADS!!!!!

It is a fact that a new exhaust causes faster acceleration, better gas mileage, shorter braking distances, and brighter headlights.

Yes. You're right, of course. And it's also well known that the louder the exhaust the greater the improvement to all those things .....  What was I thinking???   

...ken...

Quote from: Ken in Regina on January 02, 2011, 09:23:31 AM

Quote from: XealotX on January 02, 2011, 08:29:59 AM

Quote from: Ken in Regina on January 01, 2011, 11:22:00 AM

Hey Mart3y,

If you don't have to rejet to get the bike running properly with a new exhaust, then the new exhaust is not giving you anything but noise. No performance improvement at all. Simple physics. But, hey, if noise is all you're after....

...ken...

BE GONE TROLL!!!!!! PHYSICS HAS NO PLACE IN EXHAUST THREADS!!!!!

It is a fact that a new exhaust causes faster acceleration, better gas mileage, shorter braking distances, and brighter headlights.

Yes. You're right, of course. And it's also well known that the louder the exhaust the greater the improvement to all those things .....  What was I thinking???   

...ken...

Of course, if you remove the exhaust brand's Decal from the exhaust, all benefits from fitting it disappear in an instant

Michael

I knew how my bike ran before my pipe and I noticed a difference after.  Bit like inhaling through your nose and exhaling out your mouth with a straw in it. Swap the straw for something bigger and it becomes easier.

It was not wheel popping difference but I noticed a more positive throttle response after the install.

Quote from: Twisted on January 02, 2011, 03:56:09 PM
I knew how my bike ran before my pipe and I noticed a difference after.  Bit like inhaling through your nose and exhaling out your mouth with a straw in it. Swap the straw for something bigger and it becomes easier.

It was not wheel popping difference but I noticed a more positive throttle response after the install.

Did you have to rejet the bike to get it running properly again after installing the pipe? If not, then the pipe did little or nothing to improve the "breathing" of the bike. If the pipe is the most restrictive point in the airflow and you open up that restriction, a properly jetted bike will immediately run lean. If the change was enough that there was any measurable performance change, the bike should run like crap until it's rejetted.

If the bike does not run lean after installation of the exhaust, either the exhaust was not the most restrictive point or the new exhaust doesn't flow any better than the old one. In either case, there's no performance improvement.

It's really simple: if it didn't change the flow enough to need rejetting, there was no improvement in the breathing. No improvement in breathing == no improvement in performance.

Many people are fooled into thinking their bike performs better with a louder exhaust because they don't have to twist the throttle as hard to make the noise happen. Any golfer will tell you that their drives go a lot farther when their driver makes a louder noise or a different kind of noise (they're wrong but they think it's true). The golf club manufacturers have used our auditory reactions to sell us stuff we don't need for decades. Exhaust system manufacturers do the same.

...ken...

I used to change the oil on my first car and swear it performed better when I was finished. I knew that I could feel a difference.

These types of threads drive me crazy.

Some guy reads these exhaust threads and drops real money on an exhaust upgrade expecting increased acceleration. He is going to find out later that he spent a lot of money on his $1200 bike and all he got for his work was a bike that went from sounding like a leaf blower to an angry leaf blower...assuming he installed and tuned everything correctly in the first place.

Quote from: Ken in Regina on January 02, 2011, 05:39:37 PM

Quote from: Twisted on January 02, 2011, 03:56:09 PM
I knew how my bike ran before my pipe and I noticed a difference after.  Bit like inhaling through your nose and exhaling out your mouth with a straw in it. Swap the straw for something bigger and it becomes easier.

It was not wheel popping difference but I noticed a more positive throttle response after the install.

Did you have to rejet the bike to get it running properly again after installing the pipe? If not, then the pipe did little or nothing to improve the "breathing" of the bike. If the pipe is the most restrictive point in the airflow and you open up that restriction, a properly jetted bike will immediately run lean. If the change was enough that there was any measurable performance change, the bike should run like crap until it's rejetted.

If the bike does not run lean after installation of the exhaust, either the exhaust was not the most restrictive point or the new exhaust doesn't flow any better than the old one. In either case, there's no performance improvement.

It's really simple: if it didn't change the flow enough to need rejetting, there was no improvement in the breathing. No improvement in breathing == no improvement in performance.

Many people are fooled into thinking their bike performs better with a louder exhaust because they don't have to twist the throttle as hard to make the noise happen. Any golfer will tell you that their drives go a lot farther when their driver makes a louder noise or a different kind of noise (they're wrong but they think it's true). The golf club manufacturers have used our auditory reactions to sell us stuff we don't need for decades. Exhaust system manufacturers do the same.

...ken...

I'm no exhaust expert, even though I play one on TV...

So say the system is so stuffed up that putting on a different pipe with better flow brings the system to Normal (normal as it would be on a normal bike without being stuffed up). Compared to how it Was you now have Better Performance - and - it does not run lean. Now comparing it to a normal bike there is no difference. But the comparison is not to that, it is to how the bike Was... all stuffed up.

It all depends on how the bike was to start with, doesn't it?

Michael