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YZ 125 motor blown?

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I was riding to my friends house today and i was almost there and it started to bog down, i went a little farther and it shut off, i have no clue what happened. i havent taken anything apert or looked at it because it is like -5 outside. what do you think happened? also before there was excess premix coming out of the pipe, there is a big black spot on the side of the side panel, PLEASE HELP.

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check plug you may have fouled it.check compression,is it easier to kick over?

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i have no clue, i bought it from a guy in august and he had just rubuilt it and i rode it for like 3 months

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have you checked the plug?if its too lean its possible you may have burned off the tip,too rich it could be fouled.If plug looks good and has fire then could be the top end or the carb.start with the simple things first and work your way through.

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