Question about 2004 Skyteam ST 125 OF

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Overheating i have a st 125 for field use , only done 2000 miles but its overheating , its had a few falls and i think something is missing from the end of a pipe which comes from the engine ?? any help please ?

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  • mark_redfear Apr 22, 2009

    thanks for replying , the cooling fins are getting a lot hotter than i think they should , also the bike starts to splutter in 3rd gear upward , this is cured somewhat by putting a sponge on the end of the bendable pipe ? is it some kind of filter missing ?

  • tombones May 11, 2010

    What is the bike doing that makes you think it is overheating?

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Skyteam is not a bike I am very familiar with. My best guess is that the hose is a breather hose for the crankcase. Contact the dealers parts department on that question. I looked for a free service manual download with no success. We need to start by doing some of the basics.

Got oil in the gearbox? Is it fresh oil or been in there for several months? Dirty oil causes friction, aka heat. Burn premium gas If you don't already. Install a new NGK spark plug one heat range colder than the stock plug. Service the fuel system.

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

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Remove the carburetor from the engine. Remove 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.
< < 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. Put the rest of the
carb back together, clean the air filter and install the carb. Check and tighten the carb manifold also. Let the float bowl fill then start the engine. Get back to me with your results.

Please rate this solution. Thanks!

Posted on Apr 22, 2009

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