Bustamove, great information. Now u've got me worried that there might be some fuel in my oil. My carb leaked when I started the bike and ran it up and down my drive way once. Then I noticed it was leaking and cut off the engine. I turned the fuel on and off a few times with the engine off and it still leaked. Then I took it to the dealer but I have no idea if they cheked the engine oil...most likely they didn't. If I remove the oil fill cap will I be able to notice a gas smell?
TRX2five0 has the answer you were looking for as far as what to look for if you do have fuel in your oil? His explanation is better than I could come up with.
BUT....to add to all of this. If you haven't changed your oil out yet? I would do so anyway. A few quarts of good oil and a quality filter is a cheap investment when your talking about the heart of your machine.
One issue with these engines is the transmission and engine both use the same oil. And being the transmission creates more viscosity breakdown due to shearing of the oils VII package by the oil running through the gears. It's so important we keep up with the only real protection we have. And that is done by keeping an eye on the proper oil levels, and changing it when it's due.
So basically what I just said was the engine oil if broken down enough through either wear, or gas contamination can cause damage not only to the engine. But the transmission as well because of the loss of it's viscocity.
Oh, some might say ahhh don't worry about it. When the engine gets warmed up, the heat will burn off any gasoline left in the oil. Although that may be true to an extent? Oil can never regain it's viscosity when gas gets in it and thins it out. And oil can never regain viscosity after it's been subject to being to hot. And both of these factors can lead to severe engine wear in a short period of time.
I hate to ramble on about this stuff, but it's my hope a few will understand completely WHY they do something to any mechanical device. This is why I go into detail. I've worked on so many things in my lifetime that it's become habit to explain to customers and mechanics alike why we do what we do. And the big thing is I learn each and every day. Yeah, even by explaining sometimes it just CLICKS.
Good Luck. But you should be fine. (I've seen oil with fuel mix together and run into the air cleaner soaking it. Now that's bad) And they wondered why their engine wouldn't start?