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GS500 power loss.

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morty1884
L Plate Warrior



Joined: 12 Oct 2017
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PostPosted: 16:27 - 12 Oct 2017    Post subject: GS500 power loss. Reply with quote

Hi i got my first bike 1990 gs500 few month back and starting to get problem when doing 70+mph it would loose power but keep going about 50mph. Past 2 times ived used it when on motorway it just cut out and wont restart. It trys to start but nothing will happen so got leave it for 5-10 then will start up and run great. Any help or tips would be great.
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Paddy.
Red Rocket



Joined: 14 Feb 2008
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PostPosted: 16:47 - 12 Oct 2017    Post subject: Reply with quote

Switch the fuel tap to PRI.

Fill the tank and go for a ride.

inb4 cant lose power, it has none to start with
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morty1884
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PostPosted: 16:55 - 12 Oct 2017    Post subject: Reply with quote

It doesnít matte if I change the tap position it still does it.
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Tankie
Nitrous Nuisance



Joined: 24 Feb 2017
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PostPosted: 16:59 - 12 Oct 2017    Post subject: Reply with quote

take the tap out and clean the strainer , the the bowl on the bottom of the tap ,while you down there, check to see if you have an inline filter,remove and replace
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chris-red
Have you considered a TDM?



Joined: 21 Sep 2005
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PostPosted: 18:39 - 12 Oct 2017    Post subject: Reply with quote

+1 on the fuel tap.
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Chris45
Nova Slayer



Joined: 23 Oct 2016
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PostPosted: 21:08 - 12 Oct 2017    Post subject: Reply with quote

Quote:
...leave it for 5-10 then will start up and run great.


You've just answered you're own question my friend. As advised, check the fuel tap, take it off, clean it, and maybe even replace it, either way it's a fuel starvation problem, and as the bike runs fine after 10 mins or so, you can discount any carb problems.
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temeluchus
World Chat Champion



Joined: 01 Oct 2008
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PostPosted: 21:55 - 12 Oct 2017    Post subject: Reply with quote

when it conks out try opening the fuel cap and setting it to prime.
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morty1884
L Plate Warrior



Joined: 12 Oct 2017
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PostPosted: 13:54 - 13 Oct 2017    Post subject: Reply with quote

Thanks guys i will take fuel tap off this weekend and try it.
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morty1884
L Plate Warrior



Joined: 12 Oct 2017
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PostPosted: 13:46 - 14 Oct 2017    Post subject: Reply with quote

Iíve cleaned the petcock and did notice bit Grease in there but rest looked ok. I also drained my tank and notice few paint chips floating around.
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Chris45
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Joined: 23 Oct 2016
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PostPosted: 15:13 - 14 Oct 2017    Post subject: Reply with quote

There is also a breather pipe from the tank, usually routed down inside the frame of the machine, check the end isn't blocked.
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morty1884
L Plate Warrior



Joined: 12 Oct 2017
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PostPosted: 15:20 - 14 Oct 2017    Post subject: Reply with quote

Chris45 wrote:
There is also a breather pipe from the tank, usually routed down inside the frame of the machine, check the end isn't blocked.
Not on mine it would seem the pipe is missing
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morty1884
L Plate Warrior



Joined: 12 Oct 2017
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PostPosted: 15:25 - 14 Oct 2017    Post subject: Reply with quote

here some pictures
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Tankie
Nitrous Nuisance



Joined: 24 Feb 2017
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PostPosted: 15:55 - 14 Oct 2017    Post subject: Reply with quote

Blow it through with an air line if you have access to one
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Stoker
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Joined: 13 Sep 2014
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PostPosted: 17:14 - 14 Oct 2017    Post subject: Reply with quote

That looks a bit manky! As others have said, fuel starvation... if it was mine I'd be wondering about the state of the carbs too, but at this stage I'd settle for checking on delivery to the carbs first.

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chris-red
Have you considered a TDM?



Joined: 21 Sep 2005
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PostPosted: 20:01 - 14 Oct 2017    Post subject: Reply with quote

Old Guitar Strings are great to clear those breathers.
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Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.
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