Question about 2004 Skyteam ST 125 Y

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Skyteam st125y dies on rev

I have a skyteam st125y and when i start it and rev it it ***** out or when i try and rive it and i get to the end of a gear it dies out
and can misfire has this got anything to do with the carb

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  • bokkor3 May 11, 2010

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I had the same problem with the same bike... if the bike is not very old then it should be the mixture gage which is a gold screw looking thing, on the right hand side of the bike, so it mite jus need adjusting and then need the throttle cable adjusting after as it changes the rev count aswell, jus keep adjusting it and then trying it again, if its reasonably old then it is most probably the carb. Hope this helped u out...

Posted on May 08, 2010

  • mark080 Oct 11, 2010

    The manual for this bike is wrong. When it says the choke is off it is actually on. Once i decovered this and set the choke right the bike ran great. Choke switch all the way down if off.



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I have an st125y which a just put in a new piston kit,i have the conpression back but it wont start any solutions would be great

is everything tite--torqued to specs--cud hav a compression leak--also chec batt and firing--is fuel flowing

Nov 19, 2011 | 2004 Skyteam ST 125 Y

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Carbeurator problem SKYTEAM ST125Y

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.

Apr 23, 2010 | 2004 Skyteam ST 125 Y

1 Answer

Cleaned carb - revs high

You must have wrongly fitted it back,check throttle cable and see if the carb air intake is closing properly when throttle is released.This should solve your problem.

Sep 26, 2009 | 2004 Skyteam ST 125 SM

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.
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

Need new clutch wire

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!


Mar 29, 2009 | 2004 Skyteam ST 125 Y

1 Answer

Splatter in its revs

Do you have points or electronic ignition ? If points fitted I'd say the gap needs reset or a new condensor fitted. If electronic it sounds like the igniter box is defective. Make sure spark plug is good and that lead is correctly attached to plug cap.

Dec 11, 2008 | 2004 Skyteam ST 125 Y

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