250-500cc Wr 300 Question?

Ok so today I looped out and the bike was upside down for about 10-15 sec. it continued to run so I picked it up and rode back down the hill. For about 10 min more I had a big blue cloud, from my transmission oil, then it went away and ran great. I was not concerned knowing it was upside down but my KTM friends said that should not happen on a 2T. So should I be concerned?

Sure you didn't load your crank with oil and gas mix? It'll do the same.

+1^^^

probably just loaded your lower end full of gas/premix...for some reason took a minute too finally come up...

surely the crankcase breather doesnt go into the airbox like the 4 strokes does it?

No the breather does not go into the air box. And the smell was not that of premix but of 10/40.

Are you missing/low on trans oil?

The crankcase and the gearbox are not connected. You should never burn trans oil unless a seal has failed.

Do you think some of your trans oil might have leaked out the breather tube and oiled up the outside of the motor or exhaust? That'll smoke pretty good. Could last several minutes depending on what go oiled.

Another possibility, you could of had a bunch of oil (spooge) laying up in the powervalve area. When you laid your bike over, it ran into the cylinder. If your crankcase seal was bad on the tranny side it would be sucking oil all the time. I still think you ran gas into your crank and it could have even filled your pipe a little and mixed with some spooge laying in it.

There's also residual 2 stroke oil buildup in your crankcase. If you overturn the bike with the motor warm then the residual oil (minus gasoline) will drop into the combustion chamber. Not saying this is what happened, but its a possibility.