Question about 2003 Yamaha YZ 125

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Yz 125cc 2003

I have a yz 125cc 2003 and it keeps cutting out after a while and the spark plug would be covered black. After that the bike refuses to start and a friend recomended i check the petrol: 2stroke ratio. do you no what the petrol:2 stroke ratio for a yz 125 is?

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  • bbeechy3 May 26, 2009

    i keep having the same problem. the spark plug keeps getting clogged with oil. then the bike cuts out and will not start again untill i put a new plug in.

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  • Yamaha Master
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Black spark plug means too rich , you will have to replace the spark plug since it has foul up and reset the air mixture screw on the carburator 2 and 1/2 turns outwards.
Check the air filter too.
Hope this helps.

Posted on May 23, 2009

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