So, I'm trying to decide whether I want to purchase an aftermarket exhaust or not. My bike is in need of a rejet. It came with Uni drop-in filter and I don't believe it was ever rejetted to compensate. A check of the plugs (ashy white) and hunting/hanging RPM's during idle indicate it is running very lean.
At the same time, I'm also considering forgoing any type of new exhaust and simply doing a rejet with the Uni. I wanted some guidance in the form of your opinions on how significant a difference in performance I would feel between a proper rejetting for this set-up --- aftermarket exhaust + aftermarket drop-in --- versus this one --- Uni-filter + stock exhaust.
I would like especially to have some better low end torque. As the bike is now, I have a more than acceptable mid-range but acceleration from zero leaves much to be desired. I know obviously that doing a proper rejet with an aftermarket exhaust and air filter will give me greater power than simply going w/ the stocker exhaust and aftermarket fliter but how much difference is there? Will there still be an appreciable difference in low end by simply doing an essentially stock rejet (stock exh + uni drop-in)?
As a related question, what are the differences (performance wise as well as with installation) between a full exhaust, slip-on, and bolt-on? The Wiki does not give any explanation as to performance differences between the three and for someone unfamiliar with the subject of exhausts does not give much detail as to installation requirements (what modifications might/will be needed as well as how specifically these are accomplished). For example, I read that for slip-ons (ore was it bolt-ons) a flange will need to be made to accomodate the muffler, but I don't know what a flange is nor how it is made. :dunno_white: Sorry, I know these are very basic ?'s for many but I would appreciate any help. Thanks :cheers:
For a bolt-on you'll need some sort of flange made up or a link pipe. A slip-on simply slips on (you cut the existing pipe and on it goes). Often a 'slip on' is a kit that includes a bolt-on and the slip-on link pipe.
An aftermarket exhaust is less restrictive than the stock exhaust that is full of baffles. Aftermarket exhausts are all generally high flow straight-through designs - and as a result I doubt there's much noticeable performance difference between one brand and another (at least when compared to the restrictive nature of what you're upgrading from). So the choice of exhaust really comes down to personal preference and how good a deal you can get.
Having said all that, you say that what you're really after is improved acceleration from a standing start - well, maybe you should really be looking into dropping a tooth on your front sprocket? That would probably be the most cost-effective way of improving your launch acceleration - sprockets are very cheap and easy to swap out.
Philward, thanks for all of the helpful info. What kind of tools are required to install a slip-on or bolt-on? If it requires welding, I wouldn't be able to this DIY.
Regarding the sprocket mod, I think that's a nice, inexpensive alternative but my concern there is the higher RPM's at highway speeds and the extra wear on the engine. Maybe it's really not that big a deal, I don't know. I do a good mix of street and highway riding. I guess if I were going on any extended trip I could simply pop in the stocker. Hmmm, now I have something else to think about. I think I might try that, though eventually I think I'll still want that aftermarket exhaust. Thanks for the help. Really appreciate it.
Quote from: El motociclista on April 23, 2008, 11:30:12 PM
Philward, thanks for all of the helpful info. What kind of tools are required to install a slip-on or bolt-on? If it requires welding, I wouldn't be able to this DIY.
For slip-ons pretty much all you'll need is a socket set and an angle-grinder to lop your stock exhaust off (I guess you could use a hacksaw, but there are
seriously cheap 100mm grinders these days). Really simple to do - I installed mine the afternoon it arrived.
For a bolt on, if you want a flange to be added to your existing pipe then someone would need to weld that on.
For a full system, again the same as the slip-on only you don't have to chop your exhaust (ie the whole thing comes off and gets replaced).
Any exhaust upgrade will require a rejet.See these links.
http://cgi.stanford.edu/~sanjayd/gs500/Upgrades/Exhaust
http://cgi.stanford.edu/~sanjayd/gs500/Upgrades/Rejetting
http://cgi.stanford.edu/~sanjayd/gs500/Upgrades/Rejetting-LeanOrRich?
http://cgi.stanford.edu/~sanjayd/gs500/Upgrades/AirFilter
Is the Jardine 2 in one system incredibly loud???
sound clip?
Quote from: darb85 on April 24, 2008, 11:06:50 AM
Is the Jardine 2 in one system incredibly loud???
sound clip?
A lot louder than stock. http://www.youtube.com/watch?v=_ncIcagdz6o If you want an exhaust that's quite on bottom end and loud on top end,try a Yamaha R6 slip on.Stock ones are good aftermarket is a little better.Any free flowing exhaust will require a rejet,but you already know dat.
Quote from: philward on April 24, 2008, 12:22:54 AM
For slip-ons pretty much all you'll need is a socket set and an angle-grinder to lop your stock exhaust off (I guess you could use a hacksaw, but there are seriously cheap 100mm grinders these days). Really simple to do - I installed mine the afternoon it arrived.
For a bolt on, if you want a flange to be added to your existing pipe then someone would need to weld that on.
For a full system, again the same as the slip-on only you don't have to chop your exhaust (ie the whole thing comes off and gets replaced).
Thanks for making this exhaust swap issue a little clearer.