I own a 2007 GS500F that I bought last year around August. I've never had a problem out of it. Around a week ago I was driving it home from my boyfriends house & I noticed it bogging a little bit. Not much, but just enough for me to notice something wasn't right. I figured it was due for a tune up. I got a new air filter, spark plugs, oil filter, changed the oil and cleaned out my carburetor. I didn't do a deep cleaning, just took the bowls off and cleaned the jets. I didn't mess with the floats. My fuel filter is still good. It idles at about 1,000. Maybe a little over. It isn't idling very smoothly, either. When I twist the throttle it cuts off immediately. When I turn the choke up the RPM's go to about 4,500 - 5,000, but it sounds awful. When I twist the throttle the RPM's drop and when I let it go, they shoot back up to where they were.  any ideas what it could be??

Btw, that's the first time I've ever cleaned a carburetor.. lol

Also, it runs rich, because the spark plugs I pulled out of it were black. I just ordered a stock exhaust. The guy that owned it before me, I'm assuming, didn't rejet properly or at all even. I guess I'll know when my new exhaust gets here.

Mine goes up to 3-4k with full chock for a bit. do you give it time to warm up be for driving?

i dont know... i'm just guessing right now... cos ive been too lazy to pull the bike that far apart myself...

but i would think from the desc ... you have an incorrectly positioned vacuum line (affects fuel feed from tank?)... or a blocked main jet (also affects fuel feed as pilots 'cut out' as the mains open?) .. or the mixture settings are waaaaaaaaay off....

this thinking from reading with interest the plethora of threads and info made by the real wrenchpeople around here...

i rather expect Addy .. or Weeds .. or Burnin .. or Sledge ... or Yama .. or John .. or Buddha ... may chime in and give you some proper guiding info soon enough!?

My guesses

Running too righ
And one cylinder not firing.

Try the Hillbilly carb sync method. See what that shows.

I didn't even get a chance to drive it. :/ lol it was warmed up. I even let it sit there and idle for a little bit with the choke off. Everytime I'd touch the throttle, it'd still die. Maybe I hooked one the hoses up wrong? It is a possibility. Those things are so confusing, but I'm pretty sure I got them all back in the right spot. What is the Hillbilly carb sync method? haha

http://gstwins.com/gsboard/index.php?topic=63424.msg751951#msg751951

Thanks.  I'll try that out tomorrow and let you guys know how it goes!

Pull one wire then the other. See what happens. Pull one and nothing .... That side isn't doing much. Pull other and dies.... That side is doing all the work.

And check both plugs.

Post pictures. We love pictures.

First thought was that it needed carb sync or the air filter was clogged (probably both).  But then I reviewed the OP and the 'new air filter' caught my attention. So you must have stock airbox, right?

... Anyways what I'm getting at is if you have a stock airbox and you added a new non OEM air filter, some of the 'direct replacement filters' such as HiFlo could actually be more restrictive air flow than the OEM filters... And you get a headache such as this. Some folks swap the filters without incident but best bet for replacing stock filter is to go OEM, and they are around $40 or better if I remember right.

This is one reason why folks upgrade the intake to K&N filters because you might as well pay for the lifetime filter and rejet with an additional performance perk for the cost of the OEM filters.

Also, you say the plugs are black... New ones or old ones? Or both?

- Bboy

I wanted to add that I don't think the stock exhaust will help. In fact, a less flowing exhaust would be slightly worse if you are already running rich.

In the case of the GS500, a rejet for most exhaust setups is not necessary unless the headers and pipes are dramatically changed in length or diameter.  (Though the stock setup could use a rejet straight out of the factory because they do run lean to begin with, regardless of an exhaust change) What exhaust is on there now?

- Bboy

Quote from: billieray127 on March 20, 2013, 08:18:38 PM
I own a 2007 GS500F that I bought last year around August. I've never had a problem out of it. Around a week ago I was driving it home from my boyfriends house & I noticed it bogging a little bit. Not much, but just enough for me to notice something wasn't right. I figured it was due for a tune up. I got a new air filter, spark plugs, oil filter, changed the oil and cleaned out my carburetor. I didn't do a deep cleaning, just took the bowls off and cleaned the jets. I didn't mess with the floats. My fuel filter is still good. It idles at about 1,000. Maybe a little over. It isn't idling very smoothly, either. When I twist the throttle it cuts off immediately. When I turn the choke up the RPM's go to about 4,500 - 5,000, but it sounds awful. When I twist the throttle the RPM's drop and when I let it go, they shoot back up to where they were.  any ideas what it could be??

Btw, that's the first time I've ever cleaned a carburetor.. lol

Also, it runs rich, because the spark plugs I pulled out of it were black. I just ordered a stock exhaust. The guy that owned it before me, I'm assuming, didn't rejet properly or at all even. I guess I'll know when my new exhaust gets here.

If you have a fuel filter, take it out.  We have fuel filters in the tank petcock that are a screen type material.  That may be your problem there.  Not designed for an inline filter.  Not all inline filters flow properly, causing fuel starvation (bogging, etc).  Our fuel system is like a lawn mower...gravity fed, while other bikes such as modern fuel injected ones have a fuel pump.

Also, you plugs look black since you had it on choke for a while.  Choke dumps more gas to assist with cold starting.

Okay, guys... I'm not gonna be able to mess with my bike for a few days, cause I'm going out of town. But I'll let you guys know when I get back.

As much as I hate to admit it, my exhaust looks like the person that owned it before me had a slip on on it. It's cut. Trust me, I've read and read and read about it, but I'm not exactly the richest person and just now got to where I could buy a new one. Lol but I haven't put that many miles on it.

Quote from: billieray127 on March 21, 2013, 09:47:22 PM
As much as I hate to admit it, my exhaust looks like the person that owned it before me had a slip on on it. It's cut.

Oh, I gotchya! Yeah probably sold the slip-on separate from the bike... then yeah, you do need an exhaust regardless of jetting or any other factor... its probably loud as H*!! ...

Quote from: billieray127 on March 21, 2013, 09:47:22 PM
but I'm not exactly the richest person and just now got to where I could buy a new one. Lol

Oh, you don't have to tell us or be embarassed by any of that, we already knew it... The GS500 is a thrifty bike...
unless of course you are hiding a bike cave full GS500s and more parts than a dealer  *cough adidasguy *cough* ...



- Bboy

It's very, very loud. Haha and I wish, dude. I'll post pictures of it when I get ahold of a computer.

So its the stock muffler put back onto the bike?

Not yet. I'm still waitin on it to get here.

http://m1116.photobucket.com/albumview/albums/billieray127/my%20bike/2013-03-16151649_zps67f7d1ec.jpg.html?o=0Here's a link. Idk how to embed it. Lol

To post a pic go under attachments and other options its pretty easy.

And thats horrible lol. I mean i like louder sounds and all but damn haha.

Oh okay. Thanks. & I know.  You can hear it from atleast a mile away. No exaggeration. Haha

Oh i can imagine. I had an 89 silverado and that thing was a monster when the exhaust seperated at the y-pipe.
When you first talked about it i thought it was just a bad exhaust, not mussing the muffler lol. Id worry about sometging like that here, ive seen cops with the decible-meters around big bike areas .