This weekend I've modded my 2008 GS500F. After reading as much as I could from this forum and the Wiki I decided to do exhaust, K&N filters and re-jet to suit the mods. Other dyno results point to approx 7-10 hp gain at the wheels from these mods which isn't bad considering they dyno at 35-40 hp standard.
First off was an exhaust from Formula 1 (http://www.formula1mc.com.au/). For $720 delivered I got a complete exhaust, chromed headers + mid pipe + polished allow muffer. Initially I wanted a Jardine or Vance & Hines exhaust which is what the guys in the USA use, but I couldn't find one for the 2008 model so I decided to buy local.
Removing the standard exhaust was very easy and quick. However I struck a hurdle putting on the new headers. The flange on the original exhaust is very thick and on the new headers very thin, meaning the stock header bolts were too long to be screwed in all the way. A trip to Bunnings to and I bought 4 x 8mm nuts which spaced the bolt out enough to screw in properly.
Started up with the exhaust and I grinned, certainly loud. Took it for a short ride to make sure ok and it's certainly loud - maybe too loud.
Next, remove the fuel tank to get at the carbs. I followed instructions from the "Poor mans rejetting pictorial (http://www.angelfire.com/mt2/mikesgs500/rejetting/)". Spent a few hours removing all the necessary stuff to get the carbs removed from the bike. It was pretty quick apart from it took me a little while to work out how to get the choke and throttle cables removed. I labelled everything as I went with electrical tape and a small note with a numerical order to make sure I wouldn't forget anything or do out of order.
Next problem was getting the cover off the carbs to get at the jets. For the life of me I couldn't remove the 8 x Philips head screws. I ended up stripping most of them badly. To fix I hacksawed across each bolt head, and used a flat head to remove quite easily.
Replacing the jets was quite easy, just screw out and replace with new jet, except for the main in which the jet is part of a bigger jet and has to be removed from that first.
After putting the carbs back in, I put the twin K&N filters on which means you no longer need the stock airbox and single filter which is apaprently quite restricive.
Going back together was easier than pulling apart. Took 1 hour to put it back together. Went to start the bike and it cranked over but wouldn't start. Bugger, I was thinking I'd have to strip and check everything. After a moments thought I realised I hadn't turned the pet-chicken screw back on under the tank. Fixed that and started first time.
Took it for a decent ride and gave it some stick to test out. Stock the jets from 2004 onwards are 17.5 pilot, 60 mid mains and 130 mains. All the advice points to 22.5, 65, 147.5 was the go with good exhaust and K&N's so that's what I did. Today is another scorcher here (40c) so it's hard to tell how much effect the mods had, and whether it's jetted correctly.
I have a feeling it may be a little rich, possibly need a 145 or maybe even a 142.5 main jet. I'll ride for a few days and see how it goes, then rejet it if necessary. I think I could rejet quite quickly next time, possibly without even removing the carbs from the bike. I'll update the thread with the results after more testing.
If any GS500 owners have any questions about the process I'd be happy to help. I am in no way a mechanic, so if I can perform this myself, then anyone should be able to give it a go.
(http://www.postimage.org/aV1sC8F9.jpg) (http://www.postimage.org/image.php?v=aV1sC8F9)
(http://www.postimage.org/Pq1yreU9.jpg) (http://www.postimage.org/image.php?v=Pq1yreU9)
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Damn your bike is clean!!!!
Great pics. nice mods
any year gs500 exhaust will fit on any other (V&H, Jardine, etc) some need a flange, some are full, and don't.
did you really paid $720 for a gs pipe ?
i'm on the wrong business !
nice clean gs you have thar, enjoy the rumble :)
Quote from: ohgood on February 08, 2009, 03:32:45 PM
any year gs500 exhaust will fit on any other (V&H, Jardine, etc) some need a flange, some are full, and don't.
did you really paid $720 for a gs pipe ?
That's $720 AUD, which is about the same price of a V&H or Jardine exhaust shipped to Aus. The pics I've seen of those systems is they are just painted like the stock exhaust - this is full chromed.
I contacted V&H directly and they told me they don't make one for a 2008 GS500. One would think they would know and could of informed me of that - weird.
Edit: Realised didn't have my location in profile hence the confusion. Now updated.
Yeah, V&H is painted, Jardine is stainless though, very nice.
It doesn't really matter how much it costs if you are happy with it. Looks great, probably sounds great and its unique.
Nice pics!
I found ya 147.5 too rich. I went 20 65 145 and its pretty damn good.
What are you going to do with your cracnk case breather tube?
I made an oil catch bottle for mine
http://gstwins.com/gsboard/index.php?topic=5180.msg428043#msg428043
Thanks Galahs. Good idea on the breather. I'm thinking of trying a 145 also to see how that goes. Only problem is buying jets and then if they don't work they're useless.
Do you have any tips on how to tell if it's running rich under power? My gut feeling is that it is, but it would be nice if there was an easy way for me to tell.
Spark Plug Chop is about the only method available if you don't have an oxygen sensor
Basically run it at wide open throttle in 1st gear, hit the kill switch, coast to the side of the road. Pull a spark plug and see how it looks. Blackish = rich Whitish = lean
Jetting carbs is a black art. I found mine by finding what was the lowest jets I could use without loosing power.
Lovely pipes! I was hoping to get a set of Laser Deeptone -- but getting them to Canada costs too much $$$. I am going with Vance and Hines this spring.
Hey, nice picks mate, i might have to have a look into an exhaust and set up like yours
Quote from: drewbytes on February 07, 2009, 10:51:37 PM
(http://www.postimage.org/Pq1yrGkJ.jpg) (http://www.postimage.org/image.php?v=Pq1yrGkJ)
The floats are supposed to be white? Wow, your bike is really really clean. How do you keep it so clean? You must have barely even gotten dirty taking that thing apart. Looking very good. I like the shiny shiny exhaust and those filters are cool!
Fred, my bike is just over 5,000 kms (3100 miles) old. I give it a wash every weekend, noting special, but I do wipe down pretty much everything I can reach.
Quote from: drewbytes on February 08, 2009, 03:42:04 PM
Quote from: ohgood on February 08, 2009, 03:32:45 PM
any year gs500 exhaust will fit on any other (V&H, Jardine, etc) some need a flange, some are full, and don't.
did you really paid $720 for a gs pipe ?
That's $720 AUD, which is about the same price of a V&H or Jardine exhaust shipped to Aus. The pics I've seen of those systems is they are just painted like the stock exhaust - this is full chromed.
I contacted V&H directly and they told me they don't make one for a 2008 GS500. One would think they would know and could of informed me of that - weird.
Edit: Realised didn't have my location in profile hence the confusion. Now updated.
that's odd. maybe their help desk has a flunkie, cause the gs's exhaust hasn't changed since 1989. you can take any year gs exhaust and stick it on any other year. may need to remove the center stand for some, but it will work just fine. (clarification)
Hey drewbytes, or anyone else on this thread, do you know the internal diameter of the pipe that connects to the exhaust??? Or if there is a double pipe in there (coz the diameter of the pipe at the exhaust is larger than at the header junction, cheers
Quote from: drewbytes on February 11, 2009, 12:06:22 AM
Fred, my bike is just over 5,000 kms (3100 miles) old. I give it a wash every weekend, noting special, but I do wipe down pretty much everything I can reach.
Ah, I see, so it isn't old enough for you to loose interest in cleaning it yet... When I first got my car I cleaned it all the time, but 100,000 miles later I pretty much just occasionally scrape the crud off the windows so I can see... Both of my GS500s were already long past this stage by the time I got them, so I've never really cleaned them...
Too rich - what throttle position is it acting rich? Idle ? low end ?
20 pilots is supposedly the right one. 22.5 will make it over rich 0-1/8th throttle.
And we dont touch mids, we put a washer under the needle. 147.5 is about right for the mains though.
65 mids can leave you rich in the mid range and 145 mains will of course be right up high with 65 mids in there.
Cool.
Buddha.
Thanks Buddha - great info. Idle is rich, don't need choke to start and idle like I used to. But the main spot is at full throttle around 6-9k it feels like it's way rich as sometimes it feels like it's held back from over fuelling. But my gut feel is it's rich everywhere. BTW I am at 450m elevation (1500 feet) if that makes any difference.
Before your reply I was thinking of going back to 20 pilot, 62.5 mids, and 142.5 mains. I had even considered putting the stock 60 mids back in there. I don't really want to do the washer thing as it means pulling more apart that I might stuff up.
Quote from: drewbytes on February 11, 2009, 12:40:42 PM
Thanks Buddha - great info. Idle is rich, don't need choke to start and idle like I used to. But the main spot is at full throttle around 6-9k it feels like it's way rich as sometimes it feels like it's held back from over fuelling. But my gut feel is it's rich everywhere. BTW I am at 450m elevation (1500 feet) if that makes any difference.
Before your reply I was thinking of going back to 20 pilot, 62.5 mids, and 142.5 mains. I had even considered putting the stock 60 mids back in there. I don't really want to do the washer thing as it means pulling more apart that I might stuff up.
Putting washers on is easy. I'd never done it until this past weekend and I had no trouble. I didn't even have instructions in front of me, I just read some forum posts beforehand and was able to retain enough to just do it. It really is easy...
Thanks Fred, but wouldn't going to the next size jet (62.5) do a similar thing as putting a washer on there? If 65 is too rich and 60 lean, 62.5 should be about right (in theory at least).
Quote from: drewbytes on February 11, 2009, 12:56:27 PM
Thanks Fred, but wouldn't going to the next size jet (62.5) do a similar thing as putting a washer on there? If 65 is too rich and 60 lean, 62.5 should be about right (in theory at least).
I don't know, I just do what Buddha tells me...
I did 20 - 65 - 145
no washers
did nothing to the needle
and she runs perfect.
Thanks for the input. I've got a 20 pilot, 62.5 mid and 142.5 main on the way. Will try that and see how it goes. My gut feel is that will be pretty close to spot on considering the way it is now. Possibly might need to go up 1 step to 145 main but I'll try the 20/62.5/142.5 first and see how that goes. Hopefully bits will be here tomorrow so I can do it over the weekend.
Hey drewbytes, i live in aus too and am now looking for a pipe like yours, not the flll system,just the can, iv tried the Formul 1 website, but theres no pricing on the can, you wouldn't happen to know the price of the can by itself would you??? Cheers
Quote from: Helmet27 on February 12, 2009, 05:13:30 PM
Hey drewbytes, i live in aus too and am now looking for a pipe like yours, not the flll system,just the can, iv tried the Formul 1 website, but theres no pricing on the can, you wouldn't happen to know the price of the can by itself would you??? Cheers
Yes i do. Can is $550 from memory so the pipes for $700 odd is a very good price.
I got my Jardine full system with polished can from the US shipped to OZ for less than $500. With the Aussie dollar dropping a tad lately it might be a touch more but worth checking out.
http://www.starcycle-usa.com/servlet/Detail?no=21113
Quote from: galahs on February 12, 2009, 06:47:59 PM
I got my Jardine full system with polished can from the US shipped to OZ for less than $500. With the Aussie dollar dropping a tad lately it might be a touch more but worth checking out.
http://www.starcycle-usa.com/servlet/Detail?no=21113
What did they charge for shipping? $336.95 USD is a good price, wish I'd seen that one a month ago. Did you get the QMI (quiet module) ? How loud is the exhaust without QMI? According to the site it's over 100 decibels which is pretty loud!
Cheers drewbytes and galahs, you've given much food for thought. i was planning on selling my GS when i was off my p's and moving to a bigger bike, but after searhing through this site i'v changed my mind. . .the gs stays
Hey galahs, would you please be able to post a pic of your GS with the Jardine exhaust, it looks good on the website, but nothing compares to seeing it on the bike, cheers
Yeah its pretty loud. Probably too loud if you do a lot of touring the quiet module would be a worthy investment.
It does have a nice burble however, and around town it really rumbles and makes the bike sound tough. :thumb:
:thumb: :thumb: :thumb:
Check out these links to some pics
http://gstwins.com/gsboard/index.php?topic=32377.0
Here's some pics of mine...
(http://i90.photobucket.com/albums/k248/galahs/gs500f/gsxr_indicators_rearclear_2.jpg)
(http://i90.photobucket.com/albums/k248/galahs/gs500f/gsxr_indicators_rearclear_3.jpg)
(http://i90.photobucket.com/albums/k248/galahs/gs500f/gsxr_indicators_rearclear_4.jpg)
(http://i90.photobucket.com/albums/k248/galahs/gs500f/fender_result-2.jpg)
(http://i90.photobucket.com/albums/k248/galahs/gs500f/rearfootpeg1.jpg)
(http://i90.photobucket.com/albums/k248/galahs/gs500f/quarter_view.jpg)
Galahs, cheers for the pics mate,i'm def guna invest in the full system, it looks great,and everyone says it sounds good. Only problem is that with the AU$ so bad now it'll cost me $629AU, so theres a downside. Thanks again for all the help, i'll post pictures of mine with the system on when i get the chance :)
Put the new jets in just now, and the good news (for me) is that it only took 1 hour from go to whoa. You don't even need to take the carbs off the bike. I only removed the tank and undid the 3 fuel lines, unclipped the carbs from the engine and rotated them upwards so I had access to the bottom where the jets are. So no removing various lines etc. Very easy.
I'll report back over next few days how it feels with the 20/62.5/142.5 jets.
Hey Galahs, i'v ordered the Jardine system for my GS and am now waiting for it to get here. Just a quick question, how long did it take for your order take to get from the US to Aus???
Just over 1 week mate. It was very quick.
Yeah I did my jets by just turning the carbs over too. Its easy that way. My only problem was my float bowl screws didn't come out easily. Othewr than that, its a simple job.
Cheers Galahs, now i gotta go out and get a set of K&N filters and the same jets as yours plus do a "fenderectomy" and get new indicators. And when i finish that i'll have to sit around and wait for the exhaust to get here :cry:
Hey guys, what K&N filters (or any aftermarket) should i use? if possible could you leave a part number so i can get mine easily, cheer
Quote from: Helmet27 on February 17, 2009, 03:01:48 AM
Hey guys, what K&N filters (or any aftermarket) should i use? if possible could you leave a part number so i can get mine easily, cheer
It's in the Wiki. If you want twin K&N then it's RN-0800. Probably around $80 each from a car parts store.
Thanks for the info drewbytes, i'll go searching tomorrow for them and some jets :) thanks again
An alternative to individual pods you can get a K&N Lunchbox airfilter. Its basically a large pod filter with two openings that fit onto both carbs. Its part number is RU-2970 and is hard to get in Australia. Easier and cheaper to get from overseas (isn't everything!).
(http://img252.imageshack.us/img252/8180/41pxfxknntlss500ei0.jpg) (http://imageshack.us)
(http://img252.imageshack.us/img252/5134/lunchboxkc9.jpg) (http://imageshack.us)
Also something you might be interested in is the High Speed testing I did with the GS using different configurations.
http://gstwins.com/gsboard/index.php?topic=32141.0
Quote from: Helmet27 on February 16, 2009, 05:40:31 PM
Cheers Galahs, now i gotta go out and get a set of K&N filters and the same jets as yours plus do a "fenderectomy" and get new indicators.
Check this out for some indicator ideas
http://gstwins.com/gsboard/index.php?topic=40133.0
Are you game to try this :D
(http://img176.imageshack.us/img176/7601/gsxrmirrorsok5.jpg)
galahs, I'm a little unsure of the correct procedure to get the idle correct after changing the pilot jet. When I first did it, put screws out 3 turns, tried to start bike with choke (like when stock) and wouldn't start at all - I assume because much too rich. No choke, it would start but not idle as revs too low. Increased idle speed adjustment screw until it would idle cold around 1000 rpm. That makes it idle when warm closer to 1500 rpm. Am I on the right track here or is there something I'm missing?
Nice mirror/indicators Galahs, although i think it'd b a bit harder to acheive on the naked iv got. the shop that i ordered from didnt seem to hav the lunchbox or individual K&N filters, so the guy ordered a replacement for stock 1, is there a big performance difference???
Quote from: Helmet27 on February 17, 2009, 09:15:23 PM
Nice mirror/indicators Galahs, although i think it'd b a bit harder to acheive on the naked iv got. the shop that i ordered from didnt seem to hav the lunchbox or individual K&N filters, so the guy ordered a replacement for stock 1, is there a big performance difference???
Ask them to order them in for you. They can get them, probably was just too lazy to do it. I had to wait 4 days for mine to arrive in the store as a special order.
I haven't tried it but according to everything on here a drop-in replacement filter doesn't do much, you don't even need to rejet, where as you do for the lunchbox or twin filters.
Thanks Drewbytes, i went back to the shop and he called K&N importer and i now have to pod filters on the way :) :) :)
Yeah I adjusted my GS to idle a little higher (1500rpm). Other than that I didn't touch the mixture screw at all.
Hey Galahs, did you have to do much tinkering to get the jetting right with the jardine and K&N's,or was it just a case of swap them out and ride away???
Drewbytes: with the twin K&N pod filters,was there any difficulty in putting them on??? How are they attatched to the carburretors???
Also, how is your jet testing going mate???
Galahs: i like the look of your tale indicators, where'd u get them from and for how much???
Quote from: Helmet27 on February 18, 2009, 12:20:54 AM
Drewbytes: with the twin K&N pod filters,was there any difficulty in putting them on??? How are they attatched to the carburretors???
Also, how is your jet testing going mate???
The filters come with a clamp each. They just slip over the carb and do up the clamp. Piss easy.
I've had the 20/62.5/142.5 jets in now for 2 days (100 kms) and very happy with it. At this stage I'll be leave it at that I think. With the 2 smaller jets only 1 size up it should also be good for economy.
Thanks Drewbytes, thats set my mind at ease a bit :). Sweet as for your jets man, hope it all works out!!!
Quote from: Helmet27 on February 17, 2009, 11:21:02 PM
Hey Galahs, did you have to do much tinkering to get the jetting right with the jardine and K&N's,or was it just a case of swap them out and ride away???
Not really.
Just unsrewed out the old jets,
put in the new ones,
increased the idle rpm a little (correction to previous post, its actually set at 1400 rpm )
The rear indicators are from 2003-2005 gsxr (from ebay). I then added to the Clear Alternative CTS-0027 2003-2005 GSXR clear lens (also from ebay)
Thanks both Galahs abd Drewbytes for all the help,i'll let you know how i'm going, thanks again
---Hey guys, i'v just put my K&N pod filters on and my new jets i (20,65,145) had small issue with getting into the cards cos of the week metal the screws are made of >:(. I found that the jets i replaced with the 20's seemed bigger than the 20s, either of you have a clue why this might be??? I don't have the exhaust on yet but it still runs well and is noisier too :), just that it idles farely roughly,although i'v come to the conclution that this is due to too much back pressure from the stock exhaust
---Hey Drewbytes, how is your set up working for you??? Has there been much of a performance increase???
Quote from: Helmet27 on February 25, 2009, 07:44:10 PM---Hey Drewbytes, how is your set up working for you??? Has there been much of a performance increase???
It appears to be going very well. The performance is hard to judge, but I believe it pulls harder at full throttle. The surprise I got on 1st tank after smaller jets (20/62.5/142.5) is it got better economy than stock. I'll fill again this weekend and advise if it's the same on the 2nd tank. It was definitely too rich on the last jets, these ones seem pretty good to me and look like they will give me stock like economy.
Quote from: Helmet27 on February 25, 2009, 07:44:10 PM
---Hey guys, i'v just put my K&N pod filters on and my new jets i (20,65,145) had small issue with getting into the cards cos of the week metal the screws are made of >:(. I found that the jets i replaced with the 20's seemed bigger than the 20s, either of you have a clue why this might be??? I don't have the exhaust on yet but it still runs well and is noisier too :),
???
What do you mean they seems bigger?
You might need to increase the idle rpm alittle with the new jetting. Simple rotate the white knob that is located underside of the carbs.
Also do something with your crankcase breather hose to stop it spewing oily mist all over your engine and rear wheel / brakes!
The jetting holes seemed bigger than the 20's i put in, but i wouldn't think they would be as the guy i bought it off never opened the carbs, so i might be seeing things :laugh:
Have already played around with the idle screw and gotten it right. But now i'v stumbled across a new problem:
When srarting the bike cold i put the choke on half and it ran well. When i backed it off to 1/4 a clicking noise came and then the engine cut out. I'v got no idea why this is :dunno_black: maybe just coz i'v not got a freer breathing exhaust on?
Yeah, i'v already dealt with the rocker cover breather in a similar fashion to your suggestion, thanks for the idea :)
I've found with the bigger jets that there is no need to choke at all - if I use choke it won't start. What you do is start without choke and increase the idle speed with the knob as Galahs said until it idles cold at around 1000 rpm or so. This will mean it will idle hot around 1400 rpm. You may find (as I did) that it will not idle at all until you increase the idle speed as said.
When you put the new jets in I presume you checked the writing on the jet itself to confirm it was the correct size, and likewise when removing to ensure you were putting the right jet in the right spot?
I think i will be rejetting and installing K&N air filters in very soon.. I have a Yoshimura TRS slip-on pipe attached to mine and i chose it because it is has fairings. But i got mine for AU$600 when the dollar was good against the green back. ill let you know how is it going. I get my fairing back Friday week after a lovely person dropped my bike when i was working. I have lined the tank with a anti-rust coating which was pretty straight forward. But the bike will be all black now with a zero gravity dark tinted cruiser screen.
Hey my tall friend, you didnt tell me you were getting a screen, :2guns: hahaha
Did my 2nd fill this evening, averaged 4.65 over this tank so only 2-3% greater than my average week of 4.5x. It seems that riding as I normally do economy is almost the same which is great :cheers:
Hey all, i got my Jardine today :D :D :D,took half an hour to do the swap, piss easy really. It is bloody loud man!!!!! Maybe to loud...... yeah right,haha!!!!
--------Drewbytes: thats good news mate, i hope i get mine as close as yours to stock!
--------Galahs: with your Jardine K&N's and your 20,65,145 jets on your bike, do you get alot of back-firing when down changing and decelerating? I mean, almost an excesive amount of back-firing? Coz i am, any ideas?
Yeah you get alot of backfiring if you use very hard engine braking, especially down hills. its a problem associated with having such a free flowing intake and exhaust, causes the mixture to lean out too much when the throttle is snapped shut.
I get no backfitring at all with normal riding.
Increasing the idle speed alittle can help, as does just keeping the throttle open a slight slight touch as you deaccelerate. :thumb:
Chees Galahs, i shall put that into effect immediatly. I like the backfiring,its sounds nice but sometimes it can get to much, haha. What power do you think it makes with these mods? Not much more i'd suspect, but there does seem to be more of a hit down low. . .
A few horse power or so at the most. Here is a page with a few different dyno charts.
http://gstwins.com/gsboard/index.php?topic=45924.0
Also pulling in the clutch rids the backfires if you want to be real quiet in a residential area.
Depending on your bike it might be fitted with a PAIR system if so read this
Quote
Running more lean than stock (as in an air filter that flows more air) can cause some popping on deceleration. Blocking off the secondary air (PAIR on Suzukis) may help. This is a path from the airbox to the exhaust which causes unburned fuel to detonate in the exhaust rather than being dumped into the atmosphere. The popping is the fuel being ignited by the exhaust. Blocking off the secondary air prevents the fuel from getting into the exhaust.
Thanks Galahs, yeah, i'v been trying different things to try and quiet it down, although my dads sv650's staintune muffler is VERY loud, and the 06 Bonniville with straight throughs was loud aswell,so i think the neighbours should be used to it by now :) , Plus theres a load of dickhead 20 somethings living across the road that all drive loud assed holdens and civics >:(
Your bike is an '05 isn't it? If it is,does yours have the PAIR system? Cos mines an '05. . .
Nah mine didn't. but I've seen another 2005 that did???
Thats a bit odd, i can't figure why that would be. Hey, i saw that you have done research on sonic springs, have you made that upgrade?
Hi, Drew:
Have you found the 7-10 extra horsepower you were looking for, or did you find it's less than half as much? You will get more midrange power though, and that's what matters on the street! :thumb:
I went back and looked at the dyno charts posted on this board with similar mods and it looks to me the differences in readings from probably different types of dynos is larger than the power increases we're getting by putting new pipes, filters, and jets on our bikes.
For instance, Anne's bike (1999) dyno'ed at 43.2. Other bikes, newer ones with the same mods, dyno'ed at 36 and 38, but we see a stock comparison ad showing a stock GS putting out 39 next to a 500 Ninja putting out 50. Looks to me like dynos vary more than the few ponies we're getting without head work.. and I'm talking about the bikes, not us... well.. maybe both!! :cheers:
Bill, I have no idea :dunno_white: It does feel stronger at full throttle and it is hard to quantify, but a hill I ride every day on my way to work it reaches a higher speed at the top of the hill than it did before the mods. Whether it's 1, 3, or 7 hp? Dunno. I don't intend to dyno it to find out, not that I have a before figure anyway.
Yep got 0.85kg/mm front sonic springs. Best upgrade i have ever done on the GS500.
I got them shipped direct from SonicSprings
http://www.sonicsprings.com
Drew:
An uphill test may be the best thing I could think of! Yes, hill climbing may be the best way to test the midrange of your bike. More midrange will make hills easier to climb. Are you climbing at 5000-7000 rpm like I would suspect? See what I mean? Midrange HP is what matters on the street.
Japanese engineers are pretty smart, and they design bikes to run well with near maximum mpg for their displacement. Like everyone who upgrades learns, you have to increase flow through the engine to increase HP by upgrading every component in the system; air filter, exhaust, and jets, and porting heads if you want to take it further. But, you pay a mpg penalty of about 20% for picking up a few HP. That's why the Japanese engineers made the bike the way they did in the first place. They understand that if you take the design beyond where they did, you'll pay a big price in efficiency for a little more power.
Quote from: bill14224 on February 28, 2009, 09:41:35 PM
Drew:
An uphill test is the best thing I could think of! Yes, hill climbing may be the best way to test the midrange of your bike. More midrange will make hills easier to climb. Are you climbing at 5000-7000 like I would suspect? See what I mean? Midrange HP is what matters on the street!
It's 4th gear starting from 60kph at 4000 rpm. Stock it was doing 80-90kph at the top of the hill, now it's doing 100-100 kph. So it's between 4000 - 7500rpm or so I think
Drew, if you look at the stock HP dyno graphs, you'll see a dip in midrange HP in the range you're talking about, between about 4500 and 6000 rpm, meaning it's not dropping, but not climbing in a linear fashion as we would like in a perfect world. Increasing flow through the engine improves it, but it comes at a mpg cost, which the Japanese engineers decided wasn't worth it. It's been that way since the '70s when I got involved in motorcycles. I understand why. More midrange is great, but there is a significant cost. Significantly more peak power at 9000 or more rpm costs cubic dollars, to use the words of David Johnson, the racer who posted a most interesting article on this website in the Racer's Corner. The solution to this is 4 valve per cylinder heads. With those engines you get the linear increase in power, but you have the added cost and complexity of a multi-valve design. Valve jobs for your bike are cheap. Valve jobs for a GSX-600R are not.
Quote from: galahs on February 17, 2009, 06:05:54 AM
Quote from: Helmet27 on February 16, 2009, 05:40:31 PM
Cheers Galahs, now i gotta go out and get a set of K&N filters and the same jets as yours plus do a "fenderectomy" and get new indicators.
Check this out for some indicator ideas
http://gstwins.com/gsboard/index.php?topic=40133.0
Are you game to try this :D
(http://img176.imageshack.us/img176/7601/gsxrmirrorsok5.jpg)
what screen is that? i am waiting on my Zero Gravity Touring screen to arrive, it is dark smoke. Once i have put it on ill take photos of the bike
Its a ZeroGravity Double Bubble light smoke