Question about 2003 Yamaha YZ 125

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Wont stay running with out the choke on

New to 2 stroke it rus fine with the choke on but as soon as i shut it off it stalls out , what kind of oil should i use for the mix and crank case

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It sounds like you need a carb clean performed. the idle cuciut jet is probably dirty and that is the jet that supplies gas to the combustion process at idle rpm's. when you have the choke pulled out it is adding fuel and air so when you shut off the choke the fuel supply goes away. for the oils use yamalube 2 stroke oil for pre-mix and 10w -30 gear oil for your tranny.

Posted on Dec 17, 2008

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Posted on Jan 02, 2017

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