Hey guys,  I have had a few bikes, and currently have a couple fuel injected bikes.  The only other carbed bike I've owned is a CBR F2....

I picked up a GS500 froma board member who had it stored with stabilizer, I put new gas in, and cleaned the carbs... but it just seems like it is jetted wrong.  It is bogging, and can sometimes backfire under 5k RPMS, then it's a blast.  Before I let my girlfriend start learning, I'd like to fix this problem as it could be un-nerving for a new rider.

Any insite or how-to pics would be great!

-Kitt

I am having the same problems with mine...When you say bogging...is it real jerky and hesitant when in low gear and going slow...sometimes I need to give mine alot of throttle before easing out the clutch or it stalls badly...it bumps and jerks even with light clutch. It also backfires every now and then while still warming within the first 30 min or so.

Quote from: fenderjonesy on April 19, 2007, 10:16:10 AM
I am having the same problems with mine...When you say bogging...is it real jerky and hesitant when in low gear and going slow...sometimes I need to give mine alot of throttle before easing out the clutch or it stalls badly...it bumps and jerks even with light clutch. It also backfires every now and then while still warming within the first 30 min or so.

that's the problem!

think it needs a jet adjustment.

The bike bogs below 5K because the powerband doesn't start until 5-5.5K. You can clean the carbs and rejet, that will help a lot. But to launch smoothly from a stand still, you have to be revving at LEAST 4.5K and slipping the clutch.

NGFL is right.  It bogs because it isn't a car, nor is it a Harley.  Ride it like a motorcycle, not like a Hyundai.

In first gear, you can get it to run fine from 2500, just dont expect any real power in that area ...
Pilots need to be 1 size bigger for that. 125 mians and 40 pilots, and 1 washer under mains and e turns on mix screw work well for a stock bike..

Quote from: seshadri_srinath on April 19, 2007, 11:28:34 AM
In first gear, you can get it to run fine from 2500, just dont expect any real power in that area ...
Pilots need to be 1 size bigger for that. 125 mians and 40 pilots, and 1 washer under mains and e turns on mix screw work well for a stock bike..

I need more info on how to adjust the stock set up.  it should not be bogging this bad down low... too much fuel, leading to a backfire and "jumping" take-offs.

To the guy who said you need to launch a bike at 5k.... No.  you can feather any other bike I own at lwer RPM's.  Slipping the clutch isn't "riding it like a motorcycle"

Quote from: Kitt on April 19, 2007, 11:43:05 AM

Quote from: seshadri_srinath on April 19, 2007, 11:28:34 AM
In first gear, you can get it to run fine from 2500, just dont expect any real power in that area ...
Pilots need to be 1 size bigger for that. 125 mians and 40 pilots, and 1 washer under mains and e turns on mix screw work well for a stock bike..

I need more info on how to adjust the stock set up.  it should not be bogging this bad down low... too much fuel, leading to a backfire and "jumping" take-offs.

To the guy who said you need to launch a bike at 5k.... No.  you can feather any other bike I own at lwer RPM's.  Slipping the clutch isn't "riding it like a motorcycle"

ok, the CBRF2 makes at least double the hp/tq numbers a gs500 does. Yes, you can feather the clutch at 2500 rpm.. it'll take forever to launch, and it will NOT be smooth on a GS. Just because you can feather every OTHER bike you own, doesn't mean you can do it well with a GS. Being aggressive and confrontation isn't "asking for help from experienced people who have been riding these bikes for years." Welcome to the forum.

As for adjusting the stock setup. Go to the wiki, it's in the FAQ section. There's a matrix for rejetting.

It's a 32-40 HP engine in a 400 Lbs bike...  (Mine dyno'd 33.6 HP at the wheel)

Below 4K is pretty much torture...  4k-5k is OK...  5k-6k is better... 6k-7k is great and 7k-9k is great fun...

If you rejet, I hear it has more power at the low-end...  The stock GS is pretty lean.

It shouldn't be "Bogging" 4k-5k though...  Just light on power and not as smooth as 5k-6k...  

Quote from: NiceGuysFinishLast on April 19, 2007, 11:45:27 AM

As for adjusting the stock setup. Go to the wiki, it's in the FAQ section. There's a matrix for rejetting.

Thanks.


And I was stating that the bike should move along just fine at lower RPM's.  I understand it makes very little power, but it is definately flooding up at lower RPMs

with the stock lean jetting, below about 3500 in first, the bike is jerky and not smooth unless you rev high and slip the clutch. At least both that I've ridden have been that way. Mine is especially jerky right now due to my worn chain/rear sprocket. Good thing the new ones go on tomorrow! w00t!

Quote from: NiceGuysFinishLast on April 19, 2007, 12:07:04 PM
with the stock lean jetting, below about 3500 in first, the bike is jerky and not smooth unless you rev high and slip the clutch. At least both that I've ridden have been that way. Mine is especially jerky right now due to my worn chain/rear sprocket. Good thing the new ones go on tomorrow! w00t!

I bought this bike for my girlfriend to learn on (she's been a dirty rider for 5 years, but this will be her first street bike) and to use for work once in a while... the gixxer thousand gets me into trouble sometimes.

This necessary clutch slip was natural to me to get it to pull away from a light without putting around, but I think it's going to complicate things when she's learning.

If she's done dirt, I would think she'd be ok. I drove stick cars since I was about 14.. and the slipping the clutch thing was COMPLETELY counterintuitive to me for the first day I had my bike, then I got the hang of it. If she's not a moron, she'll be fine, I'm sure. May I recommend some crashguards from sw-motech? I got mine for $120, shipped, and they're the best investment I could have made for my bike (aside from a big rubber ball to put myself inside of)

I see carb syncing in the "wiki" link, but not jetting.

http://cgi.stanford.edu/~sanjayd/gs500/Upgrades/Rejetting

Quote from: Kitt on April 19, 2007, 11:43:05 AM

Quote from: seshadri_srinath on April 19, 2007, 11:28:34 AM
In first gear, you can get it to run fine from 2500, just dont expect any real power in that area ...
Pilots need to be 1 size bigger for that. 125 mians and 40 pilots, and 1 washer under mains and e turns on mix screw work well for a stock bike..

I need more info on how to adjust the stock set up.  it should not be bogging this bad down low... too much fuel, leading to a backfire and "jumping" take-offs.

To the guy who said you need to launch a bike at 5k.... No.  you can feather any other bike I own at lwer RPM's.  Slipping the clutch isn't "riding it like a motorcycle"

Oh ... adjusting the stock jetting, OK its like this.
You want to adjust them to the nearest trash can.
Same with the rear shock if you actually want anything remotely resembling a real suspension.
OK if you were in canada ... you can adjust your bikes carbs this way.
Clean them and adjust the air screws to 3 turns out and set the floats and put 1 #4 washer under the needle.
the 125/40 I suggested, came stock in every country except the US.
You're just going to have to set it to canadian stock jetting.
I will also bet, you are lean not rich at low end and I'll bet if you really are rich, your floats are waaaaay too high ... no other way to get it rich and it will go high on the floats all by itself due to wear.
Cool.
Srinath.

I8

my bike must be running better than I thought!

I usually launch at around 2500-3000rpm, and schmoo my way up to 5-7000rpm befor a change to second, third, etc.

One thing I REALLY like to hear is that 'sewing machine' sound from lower rpm's with a little throttle. CB750's really make that sound, as do a few others I've been next to in traffic. Mine doesn't do it all the time, by any means. Just depends on it's mood.

My bike is really moody too.

I finally got a chance to do some serious riding this weekend...about 250 miles. I had had the same problems with bogging and jerking at low rpm's...yeah well I was being a naughty place on the bike. To whoever said "ride it like a motorcycle" your exactly right. I wasnt giving enough throttle and feathering the clutch well. It is awesome now and never jumps or jerks around once I got the hang of the clutch/throttle. You really cant let the bike coast in gear at less than 3000 rpm's. It is a finicky bike at low engine speed...just keep it up around 4k and it is awesome.