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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hello
chack for spark in the plug.
if tou have a spark itts a gasolin froblem...
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give my a call
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