Hi guys, I need some help,
My 99 gs500e runs like a bomb till I hit about 9000 rpm...she the starts to sputter and won't reach red line at all!
Any idea what the problem may be? She's got a really dumb after-market exhaust on her from the previous owner currently....looks like a cut-up drain pipe...you can almost hear the valves through it. Is it a reverse pressure issue or a fuel supply issue?
Anyone else had this problem?
Thanks,
Nutmunk.
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ok....i've checked the plugs...a nice clean colour (not white or black)...so it's not a fuel mix issue...don't think it's a garb clog in the needles, as she's fine in every other rev range...thinking it might be the pipe...anyone else had issues with low back pressure, high-flow pipes?
Sorry I cannot help but just wanted to say you may be right about the pipe?
I would suggest that you may need to clean your carbs/jets if you havent done so already
Thanks codajastal...cars are coming off today for a good clean an re-set. Also going to stick in a new air filter...i'm thinking the previous guy might not have thought of balancing the air flow through the motor after he added the exhaust...a hog rider at the local supermarket nearly sh*t in his pants when I pulled up next to him. That's how loud this thing is. :oops:
Quote from: nutmunk on June 17, 2013, 01:02:52 AM
Thanks codajastal...cars are coming off today for a good clean an re-set. Also going to stick in a new air filter...i'm thinking the previous guy might not have thought of balancing the air flow through the motor after he added the exhaust...a hog rider at the local supermarket nearly sh*t in his pants when I pulled up next to him. That's how loud this thing is. :oops:
:D
Hahahahhahaha .... You know it's loud when the "hells angels" tell you to keep it down!! ;)
seriously...the wife has enough time to boil the kettle when she hears me coming home...if I was to open a thread for the loudest gs I think i'd currently win. It's ridiculous. Carbs are soaking in some cleaner overnight...couldn't see any blockage, but better safe than sorry later.
Ya know I do not think back pressure is an issue with a 4 stroke, the only thing I think a 4 stroke might want in an exhaust is good scavenging. If back pressue was needed than why would dragsters run zoomies? I think it might be another issue. Do you know what the jetting is and how many washers it has under the slide needle? It would be awesome to be able to just swap out the exhaust with a stock one and see if it makes a difference on the high revs. BTW I think peak power is about 8.5k RPM and anything above that is just for fun anyway :)
Hi calpantera...everything looks standard...not too sure what standard jet size is. One washer. Not so worried about not having power up at the top, but am about the spluttering that i'm getting up there.
:dunno_black:Just thinking...is it possibly a fuel supply issue then? Standard setup not able to cope with the increased amount of flow in and out of the cylinder? But then surely that would show on the plug and at all rev ranges?
Did you get a looksie at the jets so know what you are running? Also did you do a carb sync?
Quote from: Calpantera on June 17, 2013, 07:54:55 AM
Ya know I do not think back pressure is an issue with a 4 stroke...
Correct, the best thing for a 4 stroke is no exhaust pressure. The faster you can get the waste out the better, the exhaust pressure relationship is a 2 stroke thing.
Only thing I can think of is it running slightly lean? Fuel can't keep up with the airflow near redline?
Quote from: Watcher on June 17, 2013, 12:57:03 PM
Only thing I can think of is it running slightly lean? Fuel can't keep up with the airflow near redline?
Could try running with the petcock on Prime and see if it makes a diff.
My bike would starve out when on the freeway and switching to prime made it stop, so I obviously have an issue wth the diaphram in the petcock.
i may have you beat for loudness...short vid after i completed my custom exhaust (please ignore the comments made by my brother and his friends, they know not what they speak of). did not even have the K&N lunchbox on yet... that adds a good bit of "whhhaaaaaaap" to wide open throttle. :D
http://s1101.photobucket.com/user/oz353/media/DSCN0529.mp4.html
a buddy of mine says he can hear me coming 5 minutes away
Edit: Also, i do not have any problems hitting redline unless in sixth on a stretch of highway. have not been able to redline sixth ever which seems to be normal. too much wind resistance.
:icon_eek: :D .. sounds halfway between a mini hog and a rally VW bug!.. hectic! .. :icon_mrgreen:
i love it! :D :D :woohoo:
Quote from: oz353 on June 17, 2013, 04:05:21 PM
i may have you beat for loudness...short vid after i completed my custom exhaust (please ignore the comments made by my brother and his friends, they know not what they speak of). did not even have the K&N lunchbox on yet... that adds a good bit of "whhhaaaaaaap" to wide open throttle. :D
http://s1101.photobucket.com/user/oz353/media/DSCN0529.mp4.html
a buddy of mine says he can hear me coming 5 minutes away
Edit: Also, i do not have any problems hitting redline unless in sixth on a stretch of highway. have not been able to redline sixth ever which seems to be normal. too much wind resistance.
Bet the neighbours love you :icon_rolleyes:
be a good bike to ride... past the ex's house... past your old neighbours that you didnt like.. :icon_twisted:
Quote from: oz353 on June 17, 2013, 04:05:21 PM
a buddy of mine says he can hear me coming 5 minutes away
Not 'that' impressive considering its a GS...
LOL
- Bboy
Quote from: BockinBboy on June 18, 2013, 07:44:54 AM
Quote from: oz353 on June 17, 2013, 04:05:21 PM
a buddy of mine says he can hear me coming 5 minutes away
Not 'that' impressive considering its a GS...
LOL
- Bboy
Ha!
Ok...so got up early this morning to put the cars back together...also tried running her on prime...ran fine and got over 9000 at last in every gear. Now...new problem. On the way home was hitting 140k's just to test how she went...then she bogged and died. Been doing some searching on the board...seems a couple of other people have the same problem. Let her 'die', turned her over again and she started up fine again. Battery was dead this morning (don't know if that might help). Anyone figured out a definitive answer to the bog problem yet? Going to replace all the fuel lines this weekend...just in case.
:D Incidentally oz...that's JUST what mine sounds like...and have my first complaint...neighbpur through a tupperware at me this morning when I started her up at 7.30. Thinking if I keep this up I can collect a new set for the kitchen.
Ya sounds like you need to go through the rest of the fuel system now. Replace the lines, open and clean the frame petcock and the tank petcock, clean the screen on the tank petcock too. I bet that resolves your issue. When you have the frame petcock open look for tears in the diaphram. I always just run with mine on prime because I got tired of it starving out on the side of the road everytime I got on it. I think the diaphram is not opening enough to let the proper amount of fuel through.
Oh and the neighboor should be thanking you for waking them up so they do not sleep their life away ;)
Quote from: nutmunk on June 18, 2013, 11:09:45 AM
:D Incidentally oz...that's JUST what mine sounds like...and have my first complaint...neighbpur through a tupperware at me this morning when I started her up at 7.30. Thinking if I keep this up I can collect a new set for the kitchen.
:D there's a cunning plan!! :D
:thumb: I have not had any complaints....yet. +1 for running on prime all the time. Just pay attention to your trip meter. Reset at every fuel up. I can get to about 150-60 miles before I feel the need to fill up. May be able to get a tad further. That is with alot of spirited riding.
Quote from: oz353 on June 18, 2013, 03:30:50 PM
:thumb: I have not had any complaints....yet. +1 for running on prime all the time. Just pay attention to your trip meter. Reset at every fuel up. I can get to about 150-60 miles before I feel the need to fill up. May be able to get a tad further. That is with alot of spirited riding.
Ya I go about 100-120 miles before I fill up, it tops off with about 2.5 to 3 US gals (average about 40 MPG)
Sorry boys...in the good old republic of south africa, so we work in k's...and gas is insane...costed me 170 rand to fill the tank with 97 unleaded. That's about $17.12. Zeroed the trip meter, so going to establish my economy....with some seriously spirited riding.
Quote from: nutmunk on June 19, 2013, 10:59:19 AM
Sorry boys...in the good old republic of south africa, so we work in k's...and gas is insane...costed me 170 rand to fill the tank with 97 unleaded. That's about $17.12. Zeroed the trip meter, so going to establish my economy....with some seriously spirited riding.
You do not need 97 octane for a GS unless the compression ratio is non stock for some reason, mine runs fine on 89. Do you know what is th recommended octane rating for your S.A. version?
Over here we only have two options..93 or 97...since i'm at altitude, i've generally run 97...for a little extra bang. I don't know what it is with the additives over here, but you generally notice quite a bit of a performance difference between 93 and 97...i've noticed on my wife's 125, it barely crawls up hills on 93. But runs great on 97. So just stuck with it for all the bikes i've had.
Keep in mind that it is likely that the fuel ratings are calculated differently depending on your location's accepted rating formula. I don't know for certainty, but I'm willing to bet his 97 is likely different than what the 97 rating would be in the states.
- Bboy
Sa uses ron (research octane number)...I think the u.s. Uses pon (pump octane number). It's like an average of ron and another system. Our rating is normally 4 or 5 digits higher. Just in case anyone is thinking of doing some touring in sa. But what seems to make a difference over here are more the premium additives to the fuel...coastal regions only offer 93...at altitude, you have the option of 97 or 93 at a difference of about one rand between the two. But as I said, there is a distinct performance difference between the two...97 definitely gives more bang and an increase in economy (I don't know why...probably additives, but it just does. At least it seems to...but it might all be in my head), but costs a little more. But then 93 also costs more inland than it does at the coast. Go figure.
Geez that last post makes me sound like a know-it-all ass...sorry guys...i'm really not like that. Okay, maybe a little, but not normally THAT MUCH of an ass!!!!!!!
Ya here in the states they use ROM and MON averaged (R+M/2) sometimes known as POM. A RON rating of 97 would be similar to a POM rating of 92 (Yay for the internet!) which still would be high for a GS here in the US but there are other factors such as the additives that may make a difference too. As far as altitude from what I understand the higher the altitude the thinner the air so your effective compression ratio actually goes down and therefore you should actually be able to use a lower octane rating, not sure why they would offer a higher octane rating at higher altitudes. Personally I would look for a GS manual for your particular local to make sure you are not wasting money or just go by the seat of your pants method :)
Oh ya I am a know-it-a-bit ass... ;)
Ok...so replaced all the fuel lines...seemed to be the problem. Also opened up an cleaned out the tap. Just a quicky....does the gs come standard with an in-line fuel filter? Found a can one on mine...wasn't clogged up, but bypassed it anyway. Petrol in sa isn't that dirty anyway. Should it be there and should I put it back?
Ok...so done some searching around...from what I can tell, an in-line fuel filter is not standard on the gs...can't find any specific info on south africa...but since she I now running great without any problems, i'd say it was a starvation problem...might have been the lines, might have been the fuel filter. Either way, she's rumbling like a giant yellow drug fuelled highly agitated kitten again and p*ssing off my neighbours. Thanks for the help guys. Now to start planning some mods.
Thinking of starting with a can replacement...starting to go deaf. And some new front forks, but i'll save the mods for another thread. Eventually want to get her looking like the blue and gold street fighter (photohacked pic with the ducati monster backend that i've seen bouncing round in a few threads ... Hey, maybe not an original idea, but I bet it'll be the only one in south africa! And it looks GOOOD).
After writing a long rant i decided to move it here instead of taking over your thread.
http://gstwins.com/gsboard/index.php?topic=64743.new#new
okay anyways sorry for the off topic post, but i felt the need to rant at 2:30 ish in the morning after no sleep for almost 24 hours.
nice exhaust by the way, sounds unique!
and last but not least, i'm glad you were able to fix your problem!
:woohoo: Great news Nuts.. Glad you got it worked out! Now enjoy the ride!!