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Cr125 smoking like crazy

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I was riding my 00 cr125 this weekend and there was a big puff of white smoke and the motor died. Smelled kind of like burnt rubber. The motor kicks over and starts and idles fine but when you give it gas it smokes like crazy and spits tons of oil out the exhaust. Nothing was changed recently.

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sounds like a right side crankshaft seal has failed causing transmission fluid to enter the engine. The transmission fluid is burning off, resulting in lots of smoke and oil spitting out of the exhaust.  It also could be a jet that has become loose and has fallen out causing in extreme over-fueling.  You can pull the bowl off the bottom of the carburetor and make sure the pilot and main jet are still properly installed.

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