Question about Yamaha YZ 250 Motorcycles

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Hi. i have a yz250 1993. i was just going around a field slowly. try to get my son the go a little faster on his cr125. then the 250 just stopped. and would not start again. took the plug out and it was black and wet. any idea what is wrong?? i am not very good with fixing bikes. use to race when i was a kid. but now i have to learn about fixing them . hope you can help. thanks dean

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That is the indication of an over rich mixture. The plug is now carboned up and needs a good clean or replacement before it will function again.
Was the choke by any means closed or partially closed when this happened? Is the air cleaner clean so that it is not restricting air flow or is the float not stuck so that the carburetter float level is too high in the float chamber.
Those are the normal things that would cause that condition.

Posted on Mar 28, 2011

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After doing what hans has R'mended I would check your air/fuel screw usually 1.5 - 2 turns out is about right, & ensure for yz250 fuel premix of 35:1 found runs best. Also before fiddling with jetting etc test different brands of petrol, EG my yz250 would foul plugs every few hrs at ratio of 35:1 on Shell premium, but on Caltex vortex with the motoul 800 premix oil was perfect, smal plug 12 months now. U see the premium petrol has various detergents that help clean out injectors in cars & new 4 stroke bikes but on carb bikes U really need to find one that suits the bike. :-)

Posted on Mar 12, 2013


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