Oil Leak

I saw oil which I am stumped about.  There was lubricant like oil and I rubbed my fingers together to confirm and smell.  I have my bike on both stands and the sight window is definitely over filled.  The parking lot where I parked had an oil spot and part of the spill was on my kick stand and kick stand hockey puck that i use that is for kick stands to sit in so as not to sink if black top is hot.  I could not find evidence of the leak all day after doing more riding and not since my bike is back on the stands.  I don't see oil on the floor or on the hoses or motor any place..I will take it to the dealer and see what they say.  I have just past 120 miles.  Thanks all for any comments I appreciate you!

Those two gray hoses near the kickstand connect directly to the fuel tank. They don’t go anywhere else. I think there would really only be one way to get oil in the fuel tank (and come out of either of those gray hoses), and that would be to actually put oil in the fuel tank.

The drip of oily substance near the the kickstand may be from an over-lubricated drive chain? I took the plastic cover (that covers the front sprocket) off recently, and there was quite a build-up of lubricant back there. Especially in warm weather, I could see it dripping from behind/beneath that cover and onto the top of the kickstand. Maybe?

Maybe that, coincidently, also occurred around the same time that a couple drops of fuel came out of the gray fuel overflow hose (also feasible in warm weather).

Photos might help, to be sure we’re all talking about the same thing. 

Are you sure its not leaking down the OUTSIDE of the hose and actually coming from somewhere else, not from the hose? You should be able to trace an oil leak back to at least the general area of its source. Could be grease from the sprocket or oil from the chain.

Either way, you're under warranty so any oil leak at 100 miles should definitely go back to the dealer at the very least for documentation.

If you're sight window is full when standing the bike upright while the engine is cool, do not ride it. Have the dealer come and get it (they ed up prep of the bike, it should be their responsibility). An overfilled engine is dangerous. The components in the engine will start slushing the oil around at the top of the pan and causing the oil to foam. This foam can cause the oil to stop circulating around the engine and lead to unoiled components and eventually damage to the engine or complete seizing of the engine.

Dealer says the oil level (per Yamaha) should be checked after its been warmed up then it should be half way up the site window. 2 mechanics at Yamaha said this to me. As for the 1x oil leak they could not duplicate it or find any evidence so it will either rear its head again or not.

Not an MT-10 owner yet, but just wanted to comment one of those hoses is probably coming from the airbox (all bikes must have one), and too much oil would definitely dump some on the airbox via the PCV valve (too much crank pressure). You can easily suck oil from the fill plug if necessary, FYI. Finally, when overfilling becomes a real issue is when crank reaches the oil, converting it to froth, aka air in the oil. Not good. If oil looks fine, your engine should be fine. I like having it topped off, but only if you're sure bike is perfectly level, etc, so you don't overfill it. Otherwise, to the middle if fine. I always check level cold once I check hot vs cold, so it's always consistent. Good luck.