Question about 2003 Yamaha YZ 125

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I have a 2002 Yamaha Zuma II, it has a new battery, Plug and gas. It has great compression but will not start unless you spray into the carborator? I bought a new carb and checked all the jets, still the same thing no start unless you spray into the carb. What could I check for this? Carb settings, top end, spark not sure where to go from here

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  • browneye123 Nov 29, 2008

    Just two questions mate.

    What is the spark plug gap on a 2003 YZ125?
    Is there a web site where you can read a repairers manual?


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Hi and welcome to FixYa,

Based on your description, bike will start if you spray fuel into the carb, then the carb is not getting fuel. A couple of ideas you may want to explore/check/clean:

  • fuel valve;
  • some fuel valve have 3 positions, OFF, ON, PRI where the ON would only allow fuel to flow if there is sufficient vacuum from the intake manifold; the PRI allows fuel to flow unrestricted;
  • float settings of the carb;
  • fuel filter. Some tanks have built-in strainer/filter right before or part of the fuel valve.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Nov 27, 2008

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2001YZ426F oil blowing out vent tube

Dear pmg1, Sat 02-21-2009 5:37pm EST (USA)

RE: 2002 Yamaha YZ 426 F
2001 YZ426F

"Hard to Start if any and/or Oil Blowing Out Vent Tube"

RE: ABOVE is what I'm reading @ the fixya Site @ so.......

Is your Yamaha a 2000 or 2001?
Did You try to start it several times, then it kicked in a little, then a little more, then
started spitting oil and won't even start?
Has it been sitting for quite some time?
Did you put new gas in it?
If so...................................................
Check the OIL and replace if needed..........................................
Put in a can of high test GAS...Spend at least $10.00!.................
Spray a lot of Starter Fluid ($3) into the Air Intake........................
Crank Engine!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !

When you get it running, IF IT'S STILL BLOWING OIL .............................
Add a can of CRANKCASE SEAL'S LEAKS (less than $10) for conditioning
the seals............................................and......................................................



Feb 21, 2009 | 2002 Yamaha YZ 426 F

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