Question about 2003 Yamaha YZ 125

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Yamaha blaster will start if i run gas from gas line into back of carb but dies when it runs out it will also start and run sometimes i also need to know what kind of oil to run in bottom end thanks

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WHATEVER OIL YOU RUN MAKE SURE IT IS MOTORCYCLE OIL BECAUSE THERE ARE ADDITIVES IN IT TO SAVE YOUR CLUTCHES FROM ABUSE ,CHEAPEST WOULD BE YAMALUBE 1040 OR 2050 DEPENDING ON TEMP.OUTSIDE.EASIEST AND QUICKIEST REPAIR IS TO GET A MOOSE CARB REPAIR KIT FROM YOUR DEALER AND INSTALL IT THEY ARE ONLY 20 BUCKS OR CHEAPER AND IT COMES WITH JETS GASKETS AND EVERYTHING BASICALLY INSIDE THE CARB.BECAUSE EVEN IF YOUR PILOT JET IS CLOGGED AND YOU WOULD NEED A NEW 1 THEY ARE OVER TEN THRU YAMAHA,WHY NOT GET ALL OF THEM IN 1 KIT ANDINSTALL AND BE POSSITIVE EVERYTHING IS WORKING CLEAN,ITS A WISE INVESTMENT AND EASY TO INSTALL.BECAUSE YOU HAVE THE PARTS THERE TO LOOK AT

Posted on Mar 17, 2011

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ALWAYS have a fire extinguisher on hand when working on carburetors.
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. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and 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.
Before putting the slide back in the throat of the carb, move the clip on the jet needle one notch lower. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

849880b.gif Please rate this solution. Thanks!

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1 Answer

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1 maybe there is a diaghfram tear at your carb only 1 is funtioning and 1 block engine is running but under power
2.check your fuel line from tank to fuel filter then pump then carb
probally there is a debrie stuck in the pipe line or in your tank

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