Question about 2004 Yamaha YZ 125

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My yamaha yz 125

My yz 125 wont start but its getting gas and spark what else could be wrong

Posted by jmoe_365 on

  • Anonymous Mar 24, 2014

    Got a pitbike 125 its No Getting a spark what could be wrong

  • Anonymous Mar 24, 2014

    Got a pitbike 125 its No Getting a spark what could be wrong it was running 2 days ago



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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.

Posted on Sep 12, 2010



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Hi i have a yamaha yz 125 1989 modle it starts then stops cleaned carb and looked at the wiring and it still sparks what can it be please help if can

Posted on Jun 17, 2012


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SOURCE: what spark plug for yz 125?

I have a dennis kirk book, the correct spark plug is a --BR9ES--(NGK)

i always used SAE 10w-30 oil on all my dirtbikes,
no transmission fluid

for the chain you should move the back tire back until the chain is at a snug tension

Posted on Apr 24, 2009


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SOURCE: how do i decode yamaha yz 125 engin id number

You don't decode it. It is only a production run series number. Mororcycles are like cars in that respect. It is the frame number, AKA the "VIN number", is what carries all the information. Call a dealer with the frame number and he can tell you year, paint color, specific model and more. They may have a problem if the bike is too old. Yamaha changed to a newer code system a few years back.
Can I get a “very helpful” rating on this answer?

Posted on Aug 28, 2009


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SOURCE: sparks from my exhaust ??? Yamaha yz 125

if it still runs ok ,it was probably rust or debri from the muffler,if it dosent run ,or preformance changed after the sparks,internal engine damage would be a likely cause,part of a piston ring or something like that

Posted on Oct 05, 2009

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I have 2003 yz 125 it runs teriffic and shift's grate 1-5 but it wont go in to 6st gear . any ideas

Well - you will first have to buy an earlier model to get into 6th gear. The 2003 YZ 125 is a 5 speed transmission. There's nothing wrong with your bike.

Feb 17, 2011 | 2003 Yamaha YZ 125

1 Answer

Loss of power, wont go over 40 mph, and takes a while getting there...

Check the "Basics" first. Clean Air Filter, Check the Spark Plug. When you kick it over, Is there resistance on the kick starter which means it has compression. Is it hard to start? When the motor gets tired, It will lose compression and be hard to start. I would start on the Air Filter and spark plug. Also, Does it have fresh gas in it?

Aug 10, 2010 | 2003 Yamaha YZ 125

1 Answer

Yz 125 wont start

gunk in carb jets pluged

Jun 18, 2010 | 2003 Yamaha YZ 125

1 Answer

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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