Question about 2004 Skyteam ST 125 Y

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Carbeurator problem SKYTEAM ST125Y

There is an abnormal amount of fuel being released from the overflow tube, due to problem with carb, any ideas on how to resolve this problem, apart from that the bike is running fine, ive been told its an easy fix, but i have no experiance in this field, any helpful ideas welcome.

Regards
Darren

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There is a float in the carb, that pushes up a needle valve to shut the fuel off, There must be something, a little dirt or hair stopping the valve fully closing. The bottom of the carb must be removed and the valve cleaned, It is possible to buy a new needle valve if the problem persists.
You may be able to loosen carb clamps and twist it sideways to get the bottom off, otherwise the carb will need to come off, you should be able to leave the cable and slide installed.

Posted on Apr 23, 2010

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1 Answer

Can a carb suck air through the overflow line if it has a hole in it


The overflow line is vented to the atmosphere. It will let a small amount of air to flow in both directions as the fuel level changes in the float bowl.
If yours is sucking I would say that your float height is set to low. The tube on it is only there to direct any overflowing fuel away from that area.

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May 06, 2010 | 2004 Skyteam ST 125 Y

1 Answer

No power.


I know you have cleaned the carb but ya gotta keep at it. The jets are not the problem. The problem is the little pilot circuits for low and early mid range fuel supply. Varnish or trash in the carb can be very hard to get rid of.

Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Remove the carb and then the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well. Be liberal with the spray. Also use compressed air to blow out the passage ways.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Before putting the slide back into the carb, move the clip on the jet needle down one notch. Put the rest of the
carb back together and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

Please rate this solution. Thanks!

Apr 17, 2009 | 2004 Skyteam ST 125 Y

1 Answer

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if you are from UK, try ebikes in bristol they are excellent!! quick delivery and the guys know a thing or two about these bikes, let me know how you get on!

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Mar 29, 2009 | 2004 Skyteam ST 125 Y

1 Answer

Fuel pouring out of overflow tube


Yes, it sounds EXACTLY like a stuck float. You may be able to fix it yourself depending on how accessable the offending carburetor is. Quite often you can free up a stuck float by setting up a bit of vibration. Give this a try > tap the side of the carb repeatedly using the plasitc end of a screwdriver. You are not looking to hammer the thing to death, just create minor shocks. The shocks / vibration will often free up a stuck float. Please rate this solution and let me know if all went well.

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