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 Post subject: Idling problems gt500
PostPosted: Wed Apr 29, 2020 1:39 pm 
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Joined: Sun Mar 10, 2013 4:08 am
Posts: 11
Country: netherlands
Suzuki 2-Strokes: 2x GT500 1976
hi guys,

Ive bought a gt500 many years ago. With some time to burn these days i took the engine apart and replaced everything there was to replace, also the crankseals(they were toast, specially the middleone)

Now i am done rebuilding and started it up. The problem is that i can not get the bike to idle. The idle screws are turned right in to the max, airscrew 1 3/4 open, needle at it lowest. It seems it is running rich. inlet rubbers are new, carb to airfilter rubber is also new and it has a foam filter(all original)

I have the following; main jet 97,5 stat jet 30, piston 2,5 and needle 5(h or f my eyes) p17
The carbs are mikuni stamped with 15313 should be a 32mm

When i drive it full open throttle is go’s allright from second gear up. In first doesnt run clean.
Now i had the floatlevel adjusted to 27,3 wich i found in a t500 service manual. Since it isnt running maybe this is wrong? I am finding a lot of different float levels, does anyone know what the right floatlevel is for the above carb?

Also any other tips are appriciated!

Regards,
Paul- Holland

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Two Suzuki gt500’s from 1976


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PostPosted: Wed Apr 29, 2020 2:15 pm 
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Joined: Sun Apr 26, 2020 6:00 pm
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Location: Ecuador
Country: Ecuador
Suzuki 2-Strokes: 1990 AX100
What are symptoms that made you think it runs rich down low?
Be aware that the needle jet gets wallowed out after a lot of time which lets too much gas in, even at idle.


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PostPosted: Wed Apr 29, 2020 2:28 pm 
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Joined: Sun Mar 10, 2013 4:08 am
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Country: netherlands
Suzuki 2-Strokes: 2x GT500 1976
Mainly because when putting on the choke it gets worse. Also when i rev it in neutral (instant fot) it does not die, it sputters/stutters. And when driving in the upper revs it does run ok.

Hope this helps

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PostPosted: Wed Apr 29, 2020 2:46 pm 
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Joined: Sat Sep 05, 2015 3:14 pm
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Location: southeast pa
Country: us
Suzuki 2-Strokes: GT
Did you check the carb slides are in the right carbs, cutout toward air box, if slides are in the wrong carbs it will act like that. Trust me I know :oops:
I use oldjapanesebikes.com for info on GT500

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PostPosted: Wed Apr 29, 2020 2:59 pm 
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Joined: Sun Mar 10, 2013 4:08 am
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Country: netherlands
Suzuki 2-Strokes: 2x GT500 1976
karl pa wrote:
Did you check the carb slides are in the right carbs, cutout toward air box, if slides are in the wrong carbs it will act like that. Trust me I know :oops:
I use oldjapanesebikes.com for info on GT500



*running to my garage, flashlight in hand and twistingoff top of carb an checking*

You are the man! I have made the same mistake! did not think it could be wrong because of the pinn, but switching left to right it can haha

I have something to do tomorrow and let you know!

How did you found it with your bike?

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PostPosted: Wed Apr 29, 2020 3:03 pm 
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Location: southeast pa
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Suzuki 2-Strokes: GT
I was talking to suzuki shop about it when it just hit us to check. About a year later, they did the same thing. Don't worry it happens alot on suzuki twins.

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PostPosted: Wed Apr 29, 2020 3:08 pm 
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Country: netherlands
Suzuki 2-Strokes: 2x GT500 1976
Ah great, thanx for the tip.

Any idea on the float hight?

I have seer ans read 30mm, 29mm, 25,8mm and the 27,3 i used.

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PostPosted: Wed Apr 29, 2020 3:14 pm 
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Location: southeast pa
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Suzuki 2-Strokes: GT
Some don't like my method. I hold the carb upside down, when float tang touches needle valve plunger the float arm should be parallel to carb body. Suzuki shop taught me that way :idea:

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PostPosted: Wed Apr 29, 2020 3:18 pm 
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Location: southeast pa
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Suzuki 2-Strokes: GT
According to ojb manual, it shows 27.25mm

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PostPosted: Wed Apr 29, 2020 11:54 pm 
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Country: netherlands
Suzuki 2-Strokes: 2x GT500 1976
Thanx, i will swap the pistons of the carbs and post my findings.

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PostPosted: Thu Apr 30, 2020 1:53 pm 
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Joined: Sun Mar 10, 2013 4:08 am
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Country: netherlands
Suzuki 2-Strokes: 2x GT500 1976
Swapped the pistons from the carbs today, total other machine with bottomend power and nicely idling. Again thanx!!

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PostPosted: Sat May 02, 2020 7:25 am 
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Joined: Mon Dec 01, 2008 2:52 am
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Location: Manchester, UK
Got to love those easy fixes :up: 8)

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PostPosted: Sat May 02, 2020 2:55 pm 
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Location: southeast pa
Country: us
Suzuki 2-Strokes: GT
:up: Great news, the 500 is a nice powerful bike, the other year I was riding with some goldwings who thought I might not be able to keep up, they laughed when I said mine fires every revolution compared to their every other, they weren't laughing when I had no trouble keeping up. (but they did make me ride behind them because the smoke)

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76 GT185
77 GT250
77 GT380
76 GT500
73 GT550
73 GT750
74 GT750
71 T250 scrambler
75 T500 cafe


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PostPosted: Sat May 02, 2020 3:16 pm 
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Joined: Sun Mar 10, 2013 4:08 am
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Country: netherlands
Suzuki 2-Strokes: 2x GT500 1976
Ha ha, the smoke.. i love the smell of burned castrol a747 oil.

Its my first ride/drive on a gt500, really liking it but mij god, at some rpm the thing is a real womanpleaser to put it nicely :wth:

That been said, this one semi ready, just bought me another gt500 yesterday :up:

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PostPosted: Sat May 02, 2020 5:32 pm 
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Joined: Sat Sep 05, 2015 3:14 pm
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Location: southeast pa
Country: us
Suzuki 2-Strokes: GT
Paulini wrote:
at some rpm the thing is a real womanpleaser to put it nicely

Yep I know what that's like. The triples are rubber mounted engines, not near as bad.
You always need more than one bike, today my GT550 hydrolocked so I pushed it to the side and got out the GT380. (but my wife don't see it the same way :roll: )

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76 GT185
77 GT250
77 GT380
76 GT500
73 GT550
73 GT750
74 GT750
71 T250 scrambler
75 T500 cafe


Last edited by karl pa on Sun May 03, 2020 5:52 am, edited 1 time in total.

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