Question about 2003 Yamaha YZ 250 F

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Yz 125 wont start

Whats the fuel bowl?? and how do u flush the carb?

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Hi,the fuel bowl is the bottom of the carb,take that of and make sure the little holes in the jets are clean.does it have a spark,have you fitted a new plug.

Posted on May 19, 2009

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Bike wont idle stalls when i stop. if i adjust the idle screw to idle properly then once i start riding and let off the throttle the rpms stay at about 3000 to 4000 like i have cruise control on. what can...


depending on the machine it is, this could be the AIR/FUEL screw it too lean.
Often it is the AP (accelerator pump) on the carb. This has diaphragm and a pin. If this gets dirt in it it can cause erratic very fast idle, once revved or "bliped". Simply remove carb. On the bottom is the bowl, and another cover. Remove the bowl and this other cover and delicately cleam both. If diaphragm is dirty chances are bowl full of gunk too.

Oct 02, 2013 | 2003 Yamaha YZ 125

1 Answer

My yamaha yz 125 01 wont start no mather how much you push it or kick it. Fauling pulgs, Back firing, and Taking water...


may have bad fuel.... has bike or fuel been sitting for a long time. drain tank and the carb bowls. try New Fresh fuel ... What do you mean by taking water??

May 15, 2011 | 2003 Yamaha YZ 125

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Yz 125 2001. starting ploblem after top end rebuild


Kinda sounds like your needle valve is sticking in your carb and it is giving it to much fuel

Jun 03, 2010 | 2003 Yamaha YZ 125

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if your getting spark than i would take the carb off and clean it you could have a cloged jet.( just because your getting fuel from tank to carb dont mean its getting from carb to jug) i would try that first......yz-maniac.

May 14, 2010 | 2004 Yamaha YZ 125

1 Answer

Help


Change plug then use a small amount of starting fluid then kick it if it fires then dies your carb needs to be cleaned pull float bowl pull both small brass jet screws and clean they must be clear to see through when put up to a light reassemble and you should be good

Jan 31, 2010 | 2004 Yamaha YZ 125

1 Answer

YZ 125 isn't getting fuel into it's cylinder


Check the carb bowl and make sure it is filling if so check the carb jets and also check the power/reed valves.

May 20, 2009 | 2003 Yamaha YZ 125

1 Answer

My 01 yz 125 wont start with kick start,n loses power in low rpms


sounds if you picked up some water/dirt in fuel when was low

clean fuel bowl and flush carb by drain port if still ruff then remove carb for cleaning

May 19, 2009 | 2003 Yamaha YZ 250 F

1 Answer

My yz 125 02, is splutering and is strugleing to pull off in 1st gear, i am told it is running too rich and i need to ajust the fuel mixture screw. How do i find this??


The fuel mix screw is otherwise known as the idle screw.
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. 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 adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. 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. If there is still a problem, then remove the slide from the throat of the carb and move the clip on the jet needle down one notch. This process should get you back on the road.

Please rate this solution. Thanks!

Apr 28, 2009 | 2003 Yamaha YZ 125

1 Answer

125cc yz motor flooded and wont start.


Start with a new stock NGK spark plug. Check for spark. If spark then do the following > >
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 ).

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. 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. Remove the two screws 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. Let the float bowl fill then start the engine. Set the idle speed with the idle screw. This process should get you back on the road.


Please rate this solution. Thanks!

Apr 01, 2009 | 2003 Yamaha YZ 125

1 Answer

Blaster wont start


Hi, If it starts on ether, then the plug is probably not too bad, spray your premix in instead and if fires OK then your carb is clogged, you can start with the float valve, open the drain screw on the float bowl and make sure it is filling, if it is, then its probably the jets or vanes are lacquered from sitting and they simply must be cleaned. Air pressure and a carb solvent works good when cleaning but other than that no magic. Good Luck, this should Fixya!

Feb 28, 2009 | 2003 Yamaha YZ 125

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