Question about 2003 Yamaha YZ 125

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2003 yz 125 recently rebuilt carb is clean. not sure what the plug gap should be? what fuel to oil ratio should i run it at?

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32-1 fuel to oil. 0.5 to 0.6 mm gap.

Posted on Nov 22, 2010

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I have a 2002 yz 125 and i just recently had it rebuilt both top and bottom end. it was running fine a couple rides then all of a sudden it started to act up when i would take it up to high end and it...


Sounds like it is running out of fuel adjust float in carb. Possible electrical connection problem with spark from coil check all wiring make sure pet **** has flow constantly of fuel.

Oct 10, 2010 | 2003 Yamaha YZ 125

2 Answers

I have a 1998 yz 125 while it is running gas is pouring out of muffle


The only way that can happen is if gas is overflowing in the carb and running down the cylinder wall and into the exhaust port and / or into the crankcase. Gearbox oil is separate from the crankcase. The crank gets lubrication from the gas/oil mix. Be sure to turn off the gas valve at the tank when the bike is not in use. If you can manage it, pull the head off, (or at least remove the spark plug ), then, with the piston at bottom of the stroke, turn the bike upside down to drain the gas from the crank. I would then remove and clean the carb to be sure the float is not sticking open. Be sure the overflow line is not blocked. Install an in-line fuel filter. Please rate my answer. Thanks.

Jan 10, 2010 | 2003 Yamaha YZ 125

1 Answer

What is the ratios of oil to gas?


32 to 1 equals 4 ounces two stroke engine oil per one gallon of gas. Be sure to use two stroke engine oil and not motor oil.10w40 motor oil is for the gearbox.

Dec 19, 2009 | 2003 Yamaha YZ 125

1 Answer

Got given a old yz 80 changed piston and rings its fireing but wont start?


I'll start with the obvious.... have you tried removing the plug, putting a little gas in the cylinder, putting the plug in and wire back on and then kicking it over? If it starts, runs for a couple seconds and dies (burns off the gas you just put in there), it's a fuel or fuel delivery problem. Has the carb been cleaned, the needle and seat checked, the float height checked, air passages cleaned out, etc.? These carbs are famous for getting gummed up after sitting a while. (I have 4 dirtbikes and clean the carbs every spring before firing them up for the first time). Is the oil to fuel mix ratio correct? Too much oil will cause this as well. If it doesn't start with gas poured in the cylinder as mentioned above, check to see how strong of a spark you have and if the plug is gapped correctly. The spark should be bright blue. Hopefully you know how to check this, but if not, take the plug out, put the plug wire back on the plug and lay the electrode end of the plug (spark end) up against the cylinder head with the end of the plug touching metal and kick the kick starter over. You should see a bright blue spark. If it's a weak spark (not bright blue) it's an electrical problem such as a faulty coil. (WARNING: DO NOT HOLD THE PLUG IN PLACE WITH YOUR BARE HAND when kicking it over. You will get zapped good if the coil/spark are ok.) Try these troubleshooting tips and then let us know the result. We'll go from there.

Oct 29, 2009 | 2003 Yamaha YZ 125

2 Answers

2003 Yamaha 125 yz plug fouls pretty quickly. running 32/1 fuel oil ratio, and using NKG plug 2411/B8ES. Do we need to run a hotter plug?


NGK BR9EG is the stock plug for your bike. You are one heat range hotter already. I suggest you go to a BR8EG to keep you in the racing plug style but one range hotter than stock. I question what 2 stroke engine oil you are using. Stick with Yamalube 2 stroke oil and you should be okay. If you are using standard motor oil like you have in the gearbox then the fouling is definitely the oil.

Oct 27, 2009 | 2003 Yamaha YZ 125

2 Answers

Oil and gas mixture coming out by exhaust


first off make sure the oil gas mixture is correct and mixed very well.... have the carb cleaned out very well or even rebuilt, jetted and adjusted...

Jul 06, 2009 | 2003 Yamaha YZ 125

1 Answer

Yz 125 99 won't run


You need to ensure for the Carburettor Needle fixed, so that the fuel injected out properly, also if the Crank Gasket should be fitted properly.

Jun 17, 2009 | 2003 Yamaha YZ 125

1 Answer

Yz 125 wont start


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.

May 19, 2009 | 2003 Yamaha YZ 250 F

2 Answers

1998 yz 125 acts as if it runs out of fuel while riding for about 2 seconds then runs fine for a while. [not good when aproaching a jump.] carburator is spotless inside ,floats are dry ,plug is normal...


If your carb is clean ..Sounds like you should look at your kill switch ...could be loose wire inside, grounding itself out ...hope this helps! other then that could be starving for fuel (carb adjust)

Mar 27, 2009 | 2003 Yamaha YZ 125

3 Answers

Oil is a grey colour in the engine of my yz 125 2001


Your bike is water cooled. Some of that water is leaking into the gear box. The cylinder gasket is the likely leak. I would let the shop take a look at it instead of trying to fix it yourself.

But be sure there is not an external source for the water. Do you wash the bike often? Ride the creek bed often? Leave the bike where the lawn sprinkler gets the bike wet? Leave it out in the rain? Change the oil and keep the bike dry. If the problem comes back then go see the dealer.

Mar 19, 2009 | 2003 Yamaha YZ 125

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