So I've just finished installing my TRS, doing the rejet and the new filter.
I forgot to take photos of all the steps i took while installing :icon_sad: , so I'll just post some finished photos and outline the steps i took :D
1) Checked location of center stand stop on stock exhaust (to assist with positioning of new)
2) Cut off the old exhaust with angle grinder and hack saw
3) Remove headers and take to exhaust shop to get end extended to accommodate the 54mm yoshi pipe
4) Cleaned headers with wire brush and rust dissolver, let dry and painted with 3M heat proof black
5) Remove Carbies (seat and fuel tank came off first)
6) Replaced jets and moved e-clip one position on needle (instead of washer)
7) Checked valves, one was slightly out but i dont have any shims
8 ) Re-installed carbies
9) Re-installed headers
10) Installed yoshi pipe
11) Balanced carbies
12) Put fuel tank and seat back on
13) Started it up and hoped for the best :icon_lol:
Now comes the question in this post;
14) Took for test ride and bike bogs down from 7500rpm (main jet too big)
What size jet should i be using for a main with an Australian bike, I got a jet kit off Buddha and the main is 142.7, which is huge compared to the 115 stock, any suggestions on what to replace it with?
And now for the pictures and some video links comparing the sound, old with new :thumb:
(http://i71.photobucket.com/albums/i138/mart3y/2002%20GS500/IMG_0393.jpg)
Shiny new exhaust :)
(http://i71.photobucket.com/albums/i138/mart3y/2002%20GS500/IMG_0397.jpg)
Painted Headers
(http://i71.photobucket.com/albums/i138/mart3y/2002%20GS500/IMG_0398.jpg)
Just a photo of the join between the yoshi and stock
http://s71.photobucket.com/albums/i138/mart3y/2002%20GS500/?action=view¤t=IMG_0391.mp4 (http://s71.photobucket.com/albums/i138/mart3y/2002%20GS500/?action=view¤t=IMG_0391.mp4)
Video of old exhaust
http://s71.photobucket.com/albums/i138/mart3y/2002%20GS500/?action=view¤t=IMG_03921.mp4 (http://s71.photobucket.com/albums/i138/mart3y/2002%20GS500/?action=view¤t=IMG_03921.mp4)
Video of new Exhaust
The TRS is heaps louder in person and sounds much nicer than stock, though I will not be surprised if i get some unwanted attention from the police :police: because it is quite loud when i give it some.
Power delivery is quite smooth, except it bogs down at 7500rpm onwards, but that just requires a new main jet.
If anyone has any questions on the install or how the exhaust is on the bike, just ask and i'll see how i go answering them :thumb:
Cheers,
Mart3y
You tried it with the stock jet?
I didn't rejet after I installed my aftermarket can and my bike runs fine. Doesn't bog anywhere in the rev range.
Don't worry about the noise. I thought my bike sounded loud too after I installed my can. You get used to it. There are much louder bikes out there ;)
BTW looks and sounds great. Nice work.
Hi Marty, fuel will be drawn through the main jet under 7500rpm but the piston/needle moves up progressively as air velocity increases - so I would imagine a much larger flat spot if the main was too big. Is it possible the tuning issue over 7500rpm is being caused by the needle being too far adjusted causing an overly rich mixture?
I run 20/65/145 on mine with ZERO adjustment to the needle clips & washers and it runs fine... rich if anything - it feels a bit doughy on hot days and seems to hammer on cold mornings & nights.
I would suggest putting the needles back in the original position and take it for a test ride... probably easier than stripping the carbies down again!
Let us know how you get on!
:cheers:
Quote from: Twisted on April 16, 2011, 05:07:01 AM
You tried it with the stock jet?
I didn't rejet after I installed my aftermarket can and my bike runs fine. Doesn't bog anywhere in the rev range.
Don't worry about the noise. I thought my bike sounded loud too after I installed my can. You get used to it. There are much louder bikes out there ;)
BTW looks and sounds great. Nice work.
I haven't tried it with the stock jet yet, it's worth a shot though, either that or a 120-122.5 (well thats just a thought anyway)
Yeah, you're right, plenty of harleys around here that are by far louder lol, people turn around when i ride past now though O0 :icon_lol:
Quote from: Unsane on April 16, 2011, 05:20:07 AM
Hi Marty, fuel will be drawn through the main jet under 7500rpm but the piston/needle moves up progressively as air velocity increases - so I would imagine a much larger flat spot if the main was too big. Is it possible the tuning issue over 7500rpm is being caused by the needle being too far adjusted causing an overly rich mixture?
I run 20/65/145 on mine with ZERO adjustment to the needle clips & washers and it runs fine... rich if anything - it feels a bit doughy on hot days and seems to hammer on cold mornings & nights.
I would suggest putting the needles back in the original position and take it for a test ride... probably easier than stripping the carbies down again!
Let us know how you get on!
:cheers:
I only moved the needle out one, so i wouldnt think that would have had that much of an effect, though i'll look into in, i dont have a great understanding of how the carbies work, so im open to suggestions lol
oh and i didnt change the mids, they are still 60's, thats why the needle got adjusted
The needle sits above the mains, not the mids.... plus the mids are not doing too much at 7500rpm
Probably the quickest diagnosis will be checking the plugs!
I had the exact problem with bogging at high rpm after exhaust and rejet, I replaced the k&N drop in with a lunchbox and now it runs perfectly,
My guess is that your too rich at high RPM
edit
Im running 20, 62.5, 142.5, stock needle
Quote from: moosehead28 on April 16, 2011, 06:36:14 AM
I had the exact problem with bogging at high rpm after exhaust and rejet, I replaced the k&N drop in with a lunchbox and now it runs perfectly,
My guess is that your too rich at high RPM
edit
Im running 20, 62.5, 142.5, stock needle
I had a mechanic take it for a ride and he noticed the exact same thing i did and he seems to think its getting too much fuel at 3/4 to full throttle, so yeah too rich.
I was also reading http://www.motorcyclecarbs.com/carbs101.pdf (http://www.motorcyclecarbs.com/carbs101.pdf)
and it says:
"The main jet controls fuel flow from 3/4 thru
full throttle, fig 5. Once the throttle is opened far
enough, the jet needle is pulled high enough out of the
needle jet and the size of the hole in the main jet
begins to regulate fuel flow."
"If the engine is running poorly at 3/4 to full throttle, the
main jet is the likely problem"
Main jets are pretty cheap, so im thinking i'll just drop the size down to a 120-122.5, just waiting to hear someones more experienced opinion lol. If not, i'll try a lunchbox filter instead
that bike sounds beautiful now.
Awesome! I installed the Yoshi slip-on, K&N lunchbox, and rejet last month. I was having some major flat issues and finally got around to tweaking it after reading this thread. I am now running 1 washer under the stopper on the needle and man it feels like a rocket now!
:woohoo:
Quote from: plewis51 on April 17, 2011, 12:14:35 PM
Awesome! I installed the Yoshi slip-on, K&N lunchbox, and rejet last month. I was having some major flat issues and finally got around to tweaking it after reading this thread. I am now running 1 washer under the stopper on the needle and man it feels like a rocket now!
:woohoo:
When it's done right it works really well, I'm gonna chase up some smaller mains today, seeing as though they are only like $10 each :thumb:
I run pretty much that same setup and dont have any problems. Perhaps it has to do with where I live?
If you want to see it ride around a little bit with the exhaust sound you can watch this video. (WARNING: You have to listen to be ramble on about crap. lol)
http://youtu.be/e7_UOWC6H1Y
I dont get all the way up in the RPMs or get on it much but should give you an idea of the sound and the lack of flat spots.
Skip to exactly 3 minutes if you want to hear it better.
Quote from: impulse816 on April 18, 2011, 03:20:37 AM
I run pretty much that same setup and dont have any problems. Perhaps it has to do with where I live?
If you want to see it ride around a little bit with the exhaust sound you can watch this video. (WARNING: You have to listen to be ramble on about crap. lol)
http://youtu.be/e7_UOWC6H1Y
I dont get all the way up in the RPMs or get on it much but should give you an idea of the sound and the lack of flat spots.
Skip to exactly 3 minutes if you want to hear it better.
The US bikes have a much larger stock main jet than the Australian bikes do. The US standard for my year is a 130 or a 135, the Aussie is a 115, so i've made the jump on the main from 115 to 142.5 without realizing i was doing such a large change.... :cookoo:
That vid isn't too bad either :thumb:
I have another question to add to this thread....
When I roll off the throttle from high revs or have no throttle when rolling down a hill, I get a sort of backfiring noise, I'm not too sure what it is or whether its alright or not?
But is it just excess fuel in the carbies being burnt off?
Its my understanding that a sign of being lean is a dead spot on acceleration or excessive backfiring on deceleration.
Quote from: impulse816 on April 18, 2011, 04:07:58 AM
Its my understanding that a sign of being lean is a dead spot on acceleration or excessive backfiring on deceleration.
Hmmm, I wouldn't expect it to be running lean cus I upped the pilot jet and moved the clip on the needle while also putting in a much bigger main jet, though it's probably worth checking the clip on the needle went the right way lol
Quote from: Mart3y on April 18, 2011, 03:39:33 AM
I have another question to add to this thread....
When I roll off the throttle from high revs or have no throttle when rolling down a hill, I get a sort of backfiring noise, I'm not too sure what it is or whether its alright or not?
But is it just excess fuel in the carbies being burnt off?
It is just after run and it's fine if its just a snap, crackle and pop sound. It sounds great eh? Puts a smile on my face when I use the engine to brake. :thumb: Most after market exhausts do this on any bike.
Quote from: Twisted on April 18, 2011, 04:56:42 AM
Quote from: Mart3y on April 18, 2011, 03:39:33 AM
I have another question to add to this thread....
When I roll off the throttle from high revs or have no throttle when rolling down a hill, I get a sort of backfiring noise, I'm not too sure what it is or whether its alright or not?
But is it just excess fuel in the carbies being burnt off?
It is just after run and it's fine if its just a snap, crackle and pop sound. It sounds great eh? Puts a smile on my face when I use the engine to brake. :thumb: Most after market exhausts do this on any bike.
True, if its just a little bit its probably nothing. I like the sound :D
Quote from: Mart3y on April 18, 2011, 03:39:33 AM
I have another question to add to this thread....
When I roll off the throttle from high revs or have no throttle when rolling down a hill, I get a sort of backfiring noise, I'm not too sure what it is or whether its alright or not?
But is it just excess fuel in the carbies being burnt off?
This popping on over-run is because the mixture is so lean with throttle closed. It is not dangerous to the engine. If you don't like the noise, you can go a size bigger on the pilot jets as they control the mixture when throttle is closed or slightly cracked open.
Quote from: 5thAve on April 18, 2011, 06:09:26 AM
Quote from: Mart3y on April 18, 2011, 03:39:33 AM
I have another question to add to this thread....
When I roll off the throttle from high revs or have no throttle when rolling down a hill, I get a sort of backfiring noise, I'm not too sure what it is or whether its alright or not?
But is it just excess fuel in the carbies being burnt off?
This popping on over-run is because the mixture is so lean with throttle closed. It is not dangerous to the engine. If you don't like the noise, you can go a size bigger on the pilot jets as they control the mixture when throttle is closed or slightly cracked open.
I actually don't mind the sound, just wanted to work out what was causing it and whether or not i need to stop it because it's damaging something
Thanks for the informative responses, nice to know I'm not damaging the GS :thumb: