2000 GS500e Carb problems

vfrocket · February 18, 2005, 07:57:58 PM

I recently resurected my 2000 gs500e from storage. i cleaned out the carb and reinstalled.

before I cleaned it it would start, but die if i tried to give it gas.

Now it will rev up real good after warmup, but wont throttle down. The butterflys are closing, beacuse i check to see taht they were. What is causing this

Any help is appriciated.

mjm · February 19, 2005, 10:09:16 AM

Quote from: vfrocketI recently resurected my 2000 gs500e from storage. i cleaned out the carb and reinstalled.

before I cleaned it it would start, but die if i tried to give it gas.

Now it will rev up real good after warmup, but wont throttle down. The butterflys are closing, beacuse i check to see taht they were. What is causing this

Any help is appriciated.

By "won't throttle down" I assume that you mean it idles at something like 3000~4000 RMP - vacum leak, stuck choke, throttle cable hanging up, or the idle adjustment screw are the first thoughts that come to mind.

Dom · February 19, 2005, 12:46:49 PM

Check your float levels.

vfrocket · February 19, 2005, 02:04:28 PM

wont throttle down i mean you twist the throttle and it revs right up, but when you let go of the throttle it continues to run fast, if not faster.

mjm · February 19, 2005, 03:04:59 PM

Quote from: vfrocketwont throttle down i mean you twist the throttle and it revs right up, but when you let go of the throttle it continues to run fast, if not faster.

Is the cable hanging up and preventing the butterfly valves from closing quickly/completely?

If not, you may have left out the very small o-rings at the top of one or both carbs when you re-assembled them

The Buddha · February 19, 2005, 05:13:27 PM

Yup ... sucking air ... you lose an o ring or 2 from the tops of the carbs ... and you running with no airbox ... that is a huge source of vacuum loss ...
Cool.
Srinath.

vfrocket · February 19, 2005, 06:14:03 PM

you talking about the little o-ring on top of the carb by the diaphrams??

Just bought 2 today, will replace tomorrow. I'll let you know what happens.

Thanks.

vfrocket · February 20, 2005, 06:43:01 PM

Good call, the o-rings were missing. however, this did not solve my problems. now it is running real rich, and the idle adjustment screw seems to hace no effect.

I am breaking it down again, and will clean and replace other o-rings.

I just dont understand this. This carb is not real complicated.

My GS is a 2000. I have not been able to lacate a "idle air/fuel mix screw anywhere on this carb. any help would be appriciated.

Kerry · February 20, 2005, 11:11:57 PM

Quote from: vfrocketMy GS is a 2000. I have not been able to lacate a "idle air/fuel mix screw anywhere on this carb. any help would be appriciated.

On U.S. bikes you have to drill out the brass cap to gain access to the air/fuel mixture screw.

The Buddha · February 20, 2005, 11:55:45 PM

You running rich ... I dont believe so ... but post symptoms anyway ... More than likely you are lean ... as usual ...
Cool.
Srinath.

vfrocket · February 21, 2005, 12:53:25 AM

Ok, I see. thanks for the Pic...

Do you think I should mess with thoes??? What I mean is take them out, clean them, and put new o-rings on them?

This motorcycle has been sitting in storage for about 3 years now.

vfrocket · February 21, 2005, 01:01:07 AM

Symptoms...

idle at about 1500, rough, and black smoke comming out exhaust.

will not run past 2000rpm now.

so far... took carb off, cleaned and blew out all passages with air. Replaced o-rings, replaced pilot jets (Destroyed removing). replaced Diaphrams.

The carb is back off the bike now, and I am waiting for new o-rings for the floats. then I will reassable and see what happens.

Do I need to pull out the fuel/air mix screws and replace o-rings on thoes as well?? If I do the factory setting I believe is 3.5 turns back from bottom out.

Thanks for all the help.

Dom · February 21, 2005, 01:58:56 AM

O-rings for floats? I think srinath was talking about the o-rings on the diaphraghm...the ones under the rubber nipple with the clamp on it. Very easy to lose upon disassembly if you aren't looking for them. There aren't really o-rings for the floats specifically unless you are talking about the needle and seat o-ring or the other one that is on the float like when you press it back onto the carb but that one shouldn't be bad yet. What o-rings did you order?

vfrocket · February 21, 2005, 02:27:21 AM

i follow you, I replaced the little o-rings by the diaphram... i just figured while I had it broken down that i may as well replace any o-rings in the carb.

dgyver · February 21, 2005, 06:32:12 AM

Fouled plugs and/or bad spark. Check and clean all of the connections in the wire harness.

The Buddha · February 21, 2005, 11:06:11 AM

OK pilots ... you swapped with the stock size ...Should've put 40's non bleed in there instead of the 37.5 ...
The float o rings are usually OK ... Does it leak ... if not they are fine. The air screws are under that brass cap kerry showed you, no need to remove and replace o rings there ... but carefully take out the cap and set them to 3 turns out. Also 125 mains for a stock bike 1 size up from 122.5, and 1 #4 washer under each needle - its available at lowes ...
Finally your problem ... check for floats being stuck open ... You are rich, but I am nearly certain you have high float ... use U tube method before doing anything and see how much the level is ...
Cool.
Srinath.

vfrocket · February 21, 2005, 11:31:49 AM

Alrighty.... progress!!!

o-rings on floats bad - replaced.

Float level, way too high, - adjusted.

cleaned air/fuel mix screw replaced o-ring. re -installed 2.5 turns as per Suzuki tech.

Then i fired her up. same story... would not idle above 1500.
white smoke coming from tail pipe, so i felt the cyliders to see if they were hot. one was, one on the right was stone cold. - pulled the plug and it was fouled, cleaned plug re-installed.

Vroom!!! she fired right up. after warm up on choke, she ran good.

Problem though, now it idles at 4000 rpm. I will let her cool off and check the throttle cable i believe it is too tight and holding the butterfly open.

I think I am nearing the finish line!!!

Thanks for your help. I will let you know if throttle cable adjustment fixes fast idle problem.

The Buddha · February 21, 2005, 01:29:07 PM

OK if throttle was binding ... it will idle at 4K hot or cold ... you might be just a shade lean, If you have 37.5 pilots .. your mix screws should be 3.5 or so ... 2.5 is lean ... too lean ...
Cool.
Srinath.

vfrocket · February 21, 2005, 02:09:36 PM

Ok... I am abut to take this to the dealer and get raked over the coals...

it ran good... then I let it cool down adjusted the throttle cable, and now were back to the same crap.

idles at 1050 rough... checked the plugs again, they were both fouled with black soot. (too rich???)

even when warm.. once you get on the throttle it dies.

i dont understand this, one minute it runs like it should, the next crap.

I am about to throw in the towel... I may be in over my head.

The Buddha · February 21, 2005, 02:13:23 PM

OK send it to me ... I'll fix it ... rejet and trouble shooting $40 and return shipping ... and Dont worry ... I usually dont have any problems spotting what might be wrong ... Its not a rebuild ... Just a clean and rejet ... but you just swapped every O-ring it has ... we should be cool ... Read the Top of the for sale section for more details/disclaimers ... but I doubt any of that is going to apply to your carbs ...
Cool.
Srinath.

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2000 GS500e Carb problems