white smoke

If it was a lot of smoke, you may have a bad Rank seal. Did it stink and have you checked the fluid level in the trans ? Rank seal is my new name for the right side crank seal because when it goes bad, it sucks in the trans fluid and burns it giving out a lot of exhaust smoke that smells RANK.
 
Sounds to me like the right side crank seal is bad or you have a cracked case, allowing trans fluid into the cylinder.
 
Riding with an air leak is how you blow the top end. If you can't do it right now the best thing to do is not ride it. You will need to do a leakdown test.