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Is it my right crank seal?

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Brought the yz250 out to the dunes this weekend with no paddle tire. Bad idea by the way haha. Anyway about 20 mins of riding go by and it starts smoking real bad and smells horrible. Is it safe to say the right seals bad? I will be preforming a leak down test this week but just wanted some input. I figured maybe its because I was runnin the bike hard with no paddle.

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Hey there. 

 

Certainly sounds like right side seal. The left would make it run lean and the right would pressureise the transmission case. It is possible that that seal is so bad that trans oil is coming back into the combustion chamber. I can't say that I have come across any threads about oil coming back into the combustion chamber but I am no expert. The leak down test will certainly tell you what is happening. Have you done a leak test before?

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Could just be burning spooge out of the exhaust. Dune riding will put a whole lot more heat in the exhaust than anything else.

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