Question about 2003 Yamaha YZ 125

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Yamaha yz125 wont start...

The other day i was riding my bike, it worked fine. The next week i tried starting it and after well over 100 kicks it still wouldn't start, I have tried a new spark plug but still wont work. What could be the problem?

Posted by jimmy_jimmy_ on

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  • Anonymous Dec 25, 2008

    hi i have a yz125 on a 1992 with the same problem

  • Anonymous Jan 04, 2009

    hi i also have the same problem and have tryed cleaning the carb and adjusting intake screw... what else could be the problem??

  • gaybear Feb 23, 2009

    I am a complete novic motocross and having problems starting I have been advised it is stale fuel and I need to remove carburettor can anyone help? Blonde and in need!

  • Anonymous Mar 05, 2009

    my bike is an old 1998 yz 125 that has fine compression new spark plug added fuel mix and it wasnt even trying to start

  • kylesczep Mar 31, 2009

    2001 Yamaha YZ 125. Good spark, fresh gas, new air filter, spark plug. No problems starting until several days ago. Built up a sweat trying to kick it over last night. Just won't start. I read some of the suggestions about tipping the bike over to allow gas to flow out the over flow tube. I will give that a try. Any other suggestions would be appreciated.

  • Pete O Jul 30, 2012

    I have a 1997 yz 125 and friday this past week it was running fine and saturday morning i started it up for about 10 min and it shut off will i was ridding it and wont start. its getting gas and spark but wont turn over . i was told its the timming? plzzz helo.

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8 Answers

Anonymous

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You should try cleaning your carb i dont know how often you clean your air filter but if you havn't done that you should do it also.after you do that turn the gas on lean it over till gas runs out the over flow and give it choke no gas and try kicking it over.you should be able to just loosen up the clamps on each side of the carb and twist it so you can get to the float bowl,unscrew the four screws and blow it out with a air nossle you can try that before you go through the troubles of taking it off to clean it.

Posted on Nov 23, 2008

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Hello there guys, listen a top tip is when the engine's cold tip the bike almost right on its side nearly touching the floof, wait for the petrol to poor out of the carb over flow pipe, this should take a matter of a few seconds, stand the bike back up again and kick and that baby should start right up, if it does then you have a problem with your float, if it still doesn,t then take it to a shop and get them to check it out, hope this helps. regards sam

Posted on Jan 24, 2009

  • Thomas Gitsham May 14, 2013

    Yea sam mine just died after i left the choke on too long and it died when i turned the choke off and then i started it it was running real bad and then bogged out. when i tried to start it i had the gas on and when i pulled out the carb (as this only happened saturday) the carb was dry so i think it may be the float.

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Ran out of petrol while riding bike, now the bike wont start ?

Posted on Jun 13, 2009

Anonymous

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Try cleaning out the exhaust, this happend with me a couple of years back, i put in some new piston rings and took my engine completly apart... In the end it was just my exhaust holding water, so all that time and effort was a waste :(

Hope this helps

Posted on Mar 22, 2009

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Try new pisten ring and that should do it

Posted on May 13, 2009

Jonathan Murray

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The primary and secondary coil left side round coverplate
need a stator puller take off stator under that two coils
check with ohm meter if you have infinite reading replace
or get spec from book but they schould be the same.ohm
the get hot and burn up.also check coil

Posted on Jan 19, 2015

David Ellis

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Hi I have just bought a yamaha 125 xn teos . the ignition had a broken key in so I replaced the ignition lock complete, I couldnt get a spark so I fitted a new coil and ht lead but still no spark, the scooter has been standing for the past few years so I thought that someone out there had the same problem, I have cleaned all connections and earth bolts etc,

Posted on May 22, 2011

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Not reyt clued up myself try puttin petrol in were plug goes if it starts its fuel not gettin thru.take plug out leave supressor cap on whilst ya kick it jst2 c if theres a spark if nt coil, points or h.t leads n check kickstart 4 compression if it goes dwn easy its prob piston rings.. 1 ov my mates bike will kick up bt cannot giv it no throttle without cuttin out engine oil foulin plug n oil comin out were plug goes thinkin gaskets me u any ideas plz

Posted on Mar 15, 2009

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