Question about 2004 Skyteam ST 125 Y

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No power. Can anyone help with this ??? The problem is you can kick start the bike first time and it will tick over no bother but if you open the throttle even a tiny bit it starts to die until you stop reving ???i've tryed a couple of places to get it fixed but they dont do skyteam st125y so i cant even get a manual for it. I've tryed a new fuel & air filter and cleaning the fuel jets and that made no difference so any advice would be great thanks.

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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!

Posted on Apr 17, 2009

  • rogerbaker Apr 08, 2011

    i have the same bike with the same problem ticked over go to rev CUT OUT i cleaned the carb ova and ova no change got a new plug started first kick reved right up prob solved good luck darren

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