Author Topic: Gs500E trouble cruising  (Read 411 times)

Offline flambert

  • Trade Count: (0)
  • Local Club Racer
  • *
  • Posts: 7
  • Karma: +1/-0
Gs500E trouble cruising
« on: August 14, 2019, 11:22:09 PM »
Hey guys,

I currently have problems with my gs500e, when I try to stay at one speed after a little time it loses power, I am able to give more throttle to accelerate. If I add choke it runs better, so that tells me that it's missing fuel.
I have tried to adjust the fuel mixture screw without success, don't know if I am doing it wrong..

The carbs are clean.

If anyone could help that would be awesome:)

Ps. It's EU version with less hp (A2)


Offline Bluesmudge

  • Trade Count: (+4)
  • World Superbike Racer
  • *****
  • Posts: 1906
  • Karma: +30/-0
Re: Gs500E trouble cruising
« Reply #1 on: August 14, 2019, 11:42:08 PM »
Do you have an in-line fuel filter?
Are you running the stock airbox/airfilter and exhaust?

AFAIK the mixture screw only affects the idle circuit. It won't do anything for you here
« Last Edit: August 14, 2019, 11:43:02 PM by Bluesmudge »

Offline Watcher

  • What is this? I always know...
  • Trade Count: (0)
  • MotoGP Racer
  • ******
  • Posts: 2407
  • Karma: +36/-0
  • MSF RiderCoach and Moto Enthusiast!
Re: Gs500E trouble cruising
« Reply #2 on: August 15, 2019, 01:35:01 AM »
Do you have an in-line fuel filter?

If that were the issue then the choke wouldn't fix the problem.

AFAIK the mixture screw only affects the idle circuit. It won't do anything for you here

I think the same.



It almost sounds like the slides are slowly falling at speed.  He can accelerate just fine so a large change in vacuum does raise them up, but holding a steady throttle loses power, so perhaps the slides are having trouble staying up.
Possible vacuum leak?
"The point of a journey is not to arrive..."

-Neil Peart

Offline flambert

  • Trade Count: (0)
  • Local Club Racer
  • *
  • Posts: 7
  • Karma: +1/-0
Re: Gs500E trouble cruising
« Reply #3 on: August 15, 2019, 09:01:13 AM »
It gets enough fuel in the carbs just not in the engine, maybe I should triple check for vacuum leak? Everything is stock.

But in case it's not a vacuum leak any other suggestions?

Offline flambert

  • Trade Count: (0)
  • Local Club Racer
  • *
  • Posts: 7
  • Karma: +1/-0
Re: Gs500E trouble cruising
« Reply #4 on: August 19, 2019, 01:09:18 PM »
Haven't been able to locate any leaks, any possibilities that it is something else? :)


Online herennow

  • Trade Count: (0)
  • Formula Extreme Racer
  • ***
  • Posts: 211
  • Karma: +3/-0
Re: Gs500E trouble cruising
« Reply #5 on: August 19, 2019, 02:20:42 PM »
what happens if you run it on prime?
What are float levels (clear tube method check takes 5 minutes)

Offline The Buddha

  • The guru Ba-moo-derator
  • Administrator
  • Trade Count: (+52)
  • Motorcycle God!
  • *****
  • Posts: 26010
  • Karma: +110/-0
Re: Gs500E trouble cruising
« Reply #6 on: August 19, 2019, 03:46:58 PM »
Steady throttle problems are because of being too lean. Its called a lean surge.
You need to check what jets you have. The restriction just prevents the slide from coming up fully right.
That wont affect jetting, I don't think. But your throttle position correlation will be useless. Its effectively like you're at 1/2 throttle even when at full throttle. Anything up to 1/2 is what the actual position is, and over 1/2. its 1/2.

Either way, all stock bike 01+ right ? 20 and 132.5 is you right jet size 3 turns and 1 washer. 89-00 would be 40 and 125/3/1.

Cool.
Buddha.
-----------------------------------------------------------------
I run a business based on other people's junk.
-----------------------------------------------------------------

Offline Bluesmudge

  • Trade Count: (+4)
  • World Superbike Racer
  • *****
  • Posts: 1906
  • Karma: +30/-0
Re: Gs500E trouble cruising
« Reply #7 on: August 20, 2019, 07:29:59 PM »
what happens if you run it on prime?
What are float levels (clear tube method check takes 5 minutes)

Yes, any change when running on prime or reserve?

Offline flambert

  • Trade Count: (0)
  • Local Club Racer
  • *
  • Posts: 7
  • Karma: +1/-0
Re: Gs500E trouble cruising
« Reply #8 on: August 21, 2019, 08:03:30 PM »
In Germany you are not allowed to change the jets since that it's "tuning"

On prime there's no difference.

If I cruise at 70km/h after a while it will lose power, if I give more throttle it's accelerating properly.
Sometimes it backfires after losing powers.

Could it be the ignition that fails?


Offline qcbaker

  • Trade Count: (0)
  • World Supersport Racer
  • *****
  • Posts: 1113
  • Karma: +13/-0
Re: Gs500E trouble cruising
« Reply #9 on: August 21, 2019, 08:44:21 PM »
It almost sounds like the slides are slowly falling at speed.  He can accelerate just fine so a large change in vacuum does raise them up, but holding a steady throttle loses power, so perhaps the slides are having trouble staying up.
Possible vacuum leak?

I think Watcher has the right idea here.

Offline flambert

  • Trade Count: (0)
  • Local Club Racer
  • *
  • Posts: 7
  • Karma: +1/-0
Re: Gs500E trouble cruising
« Reply #10 on: August 22, 2019, 07:11:03 AM »
It almost sounds like the slides are slowly falling at speed.  He can accelerate just fine so a large change in vacuum does raise them up, but holding a steady throttle loses power, so perhaps the slides are having trouble staying up.
Possible vacuum leak?

I think Watcher has the right idea here.

I think aswell, but just haven't been able to locate any leaks, I think it might be in the membrane/throttle head.
Is there a better way to detect if there is a leak than using starter fluid? any instruments?

Offline Ugluk

  • Trade Count: (0)
  • AMA Supersport Racer
  • **
  • Posts: 57
  • Karma: +1/-0
  • Pure bone muscle
Re: Gs500E trouble cruising
« Reply #11 on: August 25, 2019, 04:05:14 PM »
Do you by any chance have the hose to the carb bowl vents in the wind?
I did and it caused these exact symptoms. I had unknowingly routed mine to accompany the drainhose down behind the right side of the engine and experienced mid throttle highway surge. After spending a few hours on this forum i found out about "crosswind surge" and found my problem.
By then I had alreday cleaned my carbs, dissasembled my petcocks, serached for cracks and leaks and moved around my needles dozens of times to no avail.

Offline flambert

  • Trade Count: (0)
  • Local Club Racer
  • *
  • Posts: 7
  • Karma: +1/-0
Re: Gs500E trouble cruising
« Reply #12 on: August 29, 2019, 06:13:53 AM »
Do you by any chance have the hose to the carb bowl vents in the wind?
I did and it caused these exact symptoms. I had unknowingly routed mine to accompany the drainhose down behind the right side of the engine and experienced mid throttle highway surge. After spending a few hours on this forum i found out about "crosswind surge" and found my problem.
By then I had alreday cleaned my carbs, dissasembled my petcocks, serached for cracks and leaks and moved around my needles dozens of times to no avail.

That could be it!! I will check today or tomorrow.

Do you have any links about it, don't find anything when I search for it :)

Offline flambert

  • Trade Count: (0)
  • Local Club Racer
  • *
  • Posts: 7
  • Karma: +1/-0
Re: Gs500E trouble cruising
« Reply #13 on: August 31, 2019, 09:51:16 PM »
Do you by any chance have the hose to the carb bowl vents in the wind?
I did and it caused these exact symptoms. I had unknowingly routed mine to accompany the drainhose down behind the right side of the engine and experienced mid throttle highway surge. After spending a few hours on this forum i found out about "crosswind surge" and found my problem.
By then I had alreday cleaned my carbs, dissasembled my petcocks, serached for cracks and leaks and moved around my needles dozens of times to no avail.

Wuhuuu, that was it, now it's an amazing machine :D send me a pm with your paypal, then I will buy you a beer :)

Thanks!